diff --git a/code/lib/core-common/package.json b/code/lib/core-common/package.json
index e2cbd44ce375..ba83296fd1b3 100644
--- a/code/lib/core-common/package.json
+++ b/code/lib/core-common/package.json
@@ -44,7 +44,6 @@
   },
   "dependencies": {
     "@babel/core": "^7.20.2",
-    "@storybook/csf-tools": "7.0.0-beta.43",
     "@storybook/node-logger": "7.0.0-beta.43",
     "@storybook/types": "7.0.0-beta.43",
     "@types/babel__core": "^7.1.20",
diff --git a/code/lib/core-common/src/utils/validate-configuration-files.ts b/code/lib/core-common/src/utils/validate-configuration-files.ts
index 56cd3533be8c..b0483cd37385 100644
--- a/code/lib/core-common/src/utils/validate-configuration-files.ts
+++ b/code/lib/core-common/src/utils/validate-configuration-files.ts
@@ -2,7 +2,6 @@ import { dedent } from 'ts-dedent';
 import { promise as glob } from 'glob-promise';
 import path from 'path';
 import slash from 'slash';
-import { readConfig } from '@storybook/csf-tools';
 import { once } from '@storybook/node-logger';
 
 import { boost } from './interpret-files';
@@ -25,13 +24,5 @@ export async function validateConfigurationFiles(configDir: string) {
       No configuration files have been found in your configDir (${path.resolve(configDir)}).
       Storybook needs "main.js" file, please add it.
     `);
-  } else {
-    const main = await readConfig(mainConfigPath);
-    if (!main.hasDefaultExport) {
-      once.warn(dedent`
-        Your main.js is not using a default export, which is the recommended format. Please update it.
-        For more info: https://github.com/storybookjs/storybook/blob/next/MIGRATION.md#esm-format-in-mainjs
-      `);
-    }
   }
 }
diff --git a/code/yarn.lock b/code/yarn.lock
index fd23cbfdb5f0..a159f249980a 100644
--- a/code/yarn.lock
+++ b/code/yarn.lock
@@ -6068,7 +6068,6 @@ __metadata:
   resolution: "@storybook/core-common@workspace:lib/core-common"
   dependencies:
     "@babel/core": ^7.20.2
-    "@storybook/csf-tools": 7.0.0-beta.43
     "@storybook/node-logger": 7.0.0-beta.43
     "@storybook/types": 7.0.0-beta.43
     "@types/babel__core": ^7.1.20