The Administrator who created the account has no issues editing the page.
What I’ve tried as well is the following, I as an administrator create a new page and a new user and promote that user to Editor. When I edit the page as such:
Full Access: Users with full access can use Bricks without limitations.
Edit Content: Access is limited to editing content settings like texts, images, etc. All styling and layout-related settings, drag & drop, etc. are disabled.
No Access: User can not edit with Bricks.
You can control the access levels for different user roles under Bricks > Settings > Builder Access:
there are certainly specific elements / setups that are not editable in the Edit Content access mode although they should be. It would be best if you created an improvement request and listed those elements / setups that aren’t editable but should be in your opinion.