Downgrading to Windows 11 (and that's what it was) became very noticeable immediately. The Task Manager and START menu are now background tasks, not part of the underlying platform, so it's easy to have them locked out by a crashing task or driver issue, when in Win 10 they ALWAYS responded short of a blue screen.
My Core i9 machine which used to be snappy and load almost instantly from it's M.2 boot drive, now plods to the desktop and often just hangs for seconds at a time where nothing is running (apparently) and no memory is being used, but the PC is unresponsive. It's just a piss-poor user experience.
And do we get fixes? Nope. Arbitrary installations of AI & bloatware.
The whole "Must use MS Account for login" is beyond dumb; a security nightmare! Same account and password used for EVERYTHING that's a cloud based (e.g. exposed 24/7 to hacking).
Microsoft (if they care at this point) should look on this as another Windows Vista moment, where they need to downsize, optimise and streamline the entire platform. Treat it like a game engine and not a billboard.