diff --git a/packages/core-compat-api/src/compatWrapper/BackwardsCompatProvider.tsx b/packages/core-compat-api/src/compatWrapper/BackwardsCompatProvider.tsx
index 445f42124f..0f9ccfb2ad 100644
--- a/packages/core-compat-api/src/compatWrapper/BackwardsCompatProvider.tsx
+++ b/packages/core-compat-api/src/compatWrapper/BackwardsCompatProvider.tsx
@@ -22,7 +22,7 @@ import { AppContextProvider } from '../../../core-app-api/src/app/AppContext';
 import { RouteResolver } from '../../../core-plugin-api/src/routing/useRouteRef';
 import {
   createFrontendPlugin as createNewPlugin,
-  BackstagePlugin as NewBackstagePlugin,
+  FrontendPlugin as NewFrontendPlugin,
   appTreeApiRef,
   componentsApiRef,
   coreComponentRefs,
@@ -47,11 +47,11 @@ import { convertLegacyRouteRef } from '../convertLegacyRouteRef';
 // Make sure that we only convert each new plugin instance to its legacy equivalent once
 const legacyPluginStore = getOrCreateGlobalSingleton(
   'legacy-plugin-compatibility-store',
-  () => new WeakMap<NewBackstagePlugin, LegacyBackstagePlugin>(),
+  () => new WeakMap<NewFrontendPlugin, LegacyBackstagePlugin>(),
 );
 
 export function toLegacyPlugin(
-  plugin: NewBackstagePlugin,
+  plugin: NewFrontendPlugin,
 ): LegacyBackstagePlugin {
   let legacy = legacyPluginStore.get(plugin);
   if (legacy) {
@@ -83,7 +83,7 @@ export function toLegacyPlugin(
 }
 
 // TODO: Currently a very naive implementation, may need some more work
-function toNewPlugin(plugin: LegacyBackstagePlugin): NewBackstagePlugin {
+function toNewPlugin(plugin: LegacyBackstagePlugin): NewFrontendPlugin {
   return createNewPlugin({
     id: plugin.getId(),
   });
diff --git a/packages/frontend-app-api/src/routing/RouteTracker.test.tsx b/packages/frontend-app-api/src/routing/RouteTracker.test.tsx
index 935449b697..aeec03992f 100644
--- a/packages/frontend-app-api/src/routing/RouteTracker.test.tsx
+++ b/packages/frontend-app-api/src/routing/RouteTracker.test.tsx
@@ -46,7 +46,10 @@ describe('RouteTracker', () => {
       caseSensitive: false,
       children: [MATCH_ALL_ROUTE],
       appNode: {
-        spec: { extension: { id: 'home.page.index' }, source: { id: 'home' } },
+        spec: {
+          extension: { id: 'home.page.index' },
+          source: { id: 'home' },
+        },
       } as AppNode,
     },
     {
diff --git a/packages/frontend-app-api/src/routing/collectRouteIds.ts b/packages/frontend-app-api/src/routing/collectRouteIds.ts
index 40f71d7c81..6e9e1a6ebb 100644
--- a/packages/frontend-app-api/src/routing/collectRouteIds.ts
+++ b/packages/frontend-app-api/src/routing/collectRouteIds.ts
@@ -49,7 +49,7 @@ export function collectRouteIds(features: FrontendFeature[]): RouteRefsById {
     }
 
     for (const [name, ref] of Object.entries(feature.routes)) {
-      const refId = `${feature.pluginId}.${name}`;
+      const refId = `${feature.id}.${name}`;
       if (routesById.has(refId)) {
         throw new Error(`Unexpected duplicate route '${refId}'`);
       }
@@ -64,7 +64,7 @@ export function collectRouteIds(features: FrontendFeature[]): RouteRefsById {
       }
     }
     for (const [name, ref] of Object.entries(feature.externalRoutes)) {
-      const refId = `${feature.pluginId}.${name}`;
+      const refId = `${feature.id}.${name}`;
       if (externalRoutesById.has(refId)) {
         throw new Error(`Unexpected duplicate external route '${refId}'`);
       }
diff --git a/packages/frontend-app-api/src/tree/resolveAppNodeSpecs.ts b/packages/frontend-app-api/src/tree/resolveAppNodeSpecs.ts
index 8d73899018..f210bd1186 100644
--- a/packages/frontend-app-api/src/tree/resolveAppNodeSpecs.ts
+++ b/packages/frontend-app-api/src/tree/resolveAppNodeSpecs.ts
@@ -65,7 +65,7 @@ export function resolveAppNodeSpecs(options: {
   if (pluginExtensions.some(({ id }) => forbidden.has(id))) {
     const pluginsStr = pluginExtensions
       .filter(({ id }) => forbidden.has(id))
-      .map(({ source }) => `'${source.pluginId}'`)
+      .map(({ source }) => `'${source.id}'`)
       .join(', ');
     const forbiddenStr = [...forbidden].map(id => `'${id}'`).join(', ');
     throw new Error(
@@ -156,7 +156,7 @@ export function resolveAppNodeSpecs(options: {
     const extensionId = extension.id;
     const extensionData = data?.[extensionId];
     if (extensionData) duplicatedExtensionIds.add(extensionId);
-    const pluginId = params.source?.pluginId ?? 'internal';
+    const pluginId = params.source?.id ?? 'internal';
     const pluginCount = extensionData?.[pluginId] ?? 0;
     return {
       ...data,
diff --git a/packages/frontend-app-api/src/wiring/createApp.tsx b/packages/frontend-app-api/src/wiring/createApp.tsx
index 95e688f104..40535ae09c 100644
--- a/packages/frontend-app-api/src/wiring/createApp.tsx
+++ b/packages/frontend-app-api/src/wiring/createApp.tsx
@@ -100,10 +100,10 @@ function deduplicateFeatures(
       if (!isInternalFrontendPlugin(feature)) {
         return true;
       }
-      if (seenIds.has(feature.pluginId)) {
+      if (seenIds.has(feature.id)) {
         return false;
       }
-      seenIds.add(feature.pluginId);
+      seenIds.add(feature.id);
       return true;
     })
     .reverse();
@@ -330,7 +330,7 @@ export function createSpecializedApp(options?: {
         toInternalFrontendPlugin(feature).featureFlags.forEach(flag =>
           featureFlagApi.registerFlag({
             name: flag.name,
-            pluginId: feature.pluginId,
+            pluginId: feature.id,
           }),
         );
       }
diff --git a/packages/frontend-plugin-api/src/wiring/createFrontendPlugin.ts b/packages/frontend-plugin-api/src/wiring/createFrontendPlugin.ts
index 8be515a577..3d8c318354 100644
--- a/packages/frontend-plugin-api/src/wiring/createFrontendPlugin.ts
+++ b/packages/frontend-plugin-api/src/wiring/createFrontendPlugin.ts
@@ -33,7 +33,7 @@ export interface FrontendPlugin<
   TExtensionMap extends { [id in string]: ExtensionDefinition } = {},
 > {
   readonly $$type: '@backstage/FrontendPlugin';
-  readonly pluginId: string;
+  readonly id: string;
   readonly routes: TRoutes;
   readonly externalRoutes: TExternalRoutes;
   getExtension<TId extends keyof TExtensionMap>(id: TId): TExtensionMap[TId];
@@ -59,9 +59,7 @@ export interface PluginOptions<
   TExternalRoutes extends AnyExternalRoutes,
   TExtensions extends readonly ExtensionDefinition[],
 > {
-  /** @deprecated use `pluginId` instead */
-  id?: TId;
-  pluginId?: TId;
+  id: TId;
   routes?: TRoutes;
   externalRoutes?: TExternalRoutes;
   extensions?: TExtensions;
@@ -96,11 +94,6 @@ export function createFrontendPlugin<
     >]: KExtension;
   }
 > {
-  const pluginId = options.pluginId ?? options.id;
-  if (!pluginId) {
-    throw new Error('No pluginId provided to createFrontendPlugin');
-  }
-
   const extensions = new Array<Extension<any>>();
   const extensionDefinitionsById = new Map<
     string,
@@ -109,11 +102,11 @@ export function createFrontendPlugin<
 
   for (const def of options.extensions ?? []) {
     const internal = toInternalExtensionDefinition(def);
-    const ext = resolveExtensionDefinition(def, { namespace: pluginId });
+    const ext = resolveExtensionDefinition(def, { namespace: options.id });
     extensions.push(ext);
     extensionDefinitionsById.set(ext.id, {
       ...internal,
-      namespace: pluginId,
+      namespace: options.id,
     });
   }
 
@@ -126,7 +119,7 @@ export function createFrontendPlugin<
     );
     // TODO(Rugvip): This could provide some more information about the kind + name of the extensions
     throw new Error(
-      `Plugin '${pluginId}' provided duplicate extensions: ${duplicates.join(
+      `Plugin '${options.id}' provided duplicate extensions: ${duplicates.join(
         ', ',
       )}`,
     );
@@ -135,8 +128,7 @@ export function createFrontendPlugin<
   return {
     $$type: '@backstage/FrontendPlugin',
     version: 'v1',
-    id: pluginId, // TODO: Backwards compat to be able to install in older apps, remove after 1.31
-    pluginId,
+    id: options.id, // TODO: Backwards compat to be able to install in older apps, remove after 1.31
     routes: options.routes ?? ({} as TRoutes),
     externalRoutes: options.externalRoutes ?? ({} as TExternalRoutes),
     featureFlags: options.featureFlags ?? [],
@@ -145,18 +137,18 @@ export function createFrontendPlugin<
       return extensionDefinitionsById.get(id);
     },
     toString() {
-      return `Plugin{id=${pluginId}}`;
+      return `Plugin{id=${options.id}}`;
     },
     withOverrides(overrides) {
       const overriddenExtensionIds = new Set(
         overrides.extensions.map(
-          e => resolveExtensionDefinition(e, { namespace: pluginId }).id,
+          e => resolveExtensionDefinition(e, { namespace: options.id }).id,
         ),
       );
       const nonOverriddenExtensions = (options.extensions ?? []).filter(
         e =>
           !overriddenExtensionIds.has(
-            resolveExtensionDefinition(e, { namespace: pluginId }).id,
+            resolveExtensionDefinition(e, { namespace: options.id }).id,
           ),
       );
       return createFrontendPlugin({
@@ -175,7 +167,7 @@ export function isInternalFrontendPlugin(opaque: {
     opaque.$$type === '@backstage/FrontendPlugin' ||
     opaque.$$type === '@backstage/BackstagePlugin'
   ) {
-    // Throw if invalid + mutate
+    // Make sure we throw if invalid
     toInternalFrontendPlugin(opaque as FrontendPlugin);
     return true;
   }
@@ -198,10 +190,6 @@ export function toInternalFrontendPlugin(
       `Invalid plugin instance, bad version '${internal.version}'`,
     );
   }
-  // Backwards compatibility to support old plugins defined with just an .id
-  if (!internal.pluginId) {
-    (internal as any).pluginId = (internal as any).id;
-  }
   return internal;
 }