Definitely would be helpful if the Microsoft "AI" would help us zero in on specific area of concern. Hope you submitted this to Feedback Hub too. Looks like there are some good tools being mentioned to ferret out what are the 'real' specs.
Running DXDIAG does seem to report the correct build that is installed on mine vs the build reported on PC Health Check.
Would be surprised if we don't see a much better version the beginning of next week and perhaps better clarification of requirements for Insiders vs the Users of the Released product if there is such a thing.
Just like Musk rockets sometimes it takes a few attempts to get them into orbit. Am sure they are working to make this a smooth(er) transition. There will be some security requirements put into place as that is part of the new OS. It would not be Windows 11 if they just changed a few menus and changed the wallpaper.. .