I work with Windows 11 and don't see any major issue whatsoever. But note that 16GB RAM is "just" enough to run it smoothly. 32GB is better for serious (e.g development) work. I have run it even on Intel 4200U/4200M CPUs fine (CPU is from year 2014). I agree that new Outlook is buggy and not fully functional - that's why I still use old native MS Outlook.
My main issue with Windows 11 (and where I use it I do see quite a lot of issues) is that apparently it won't run on my personal PC at home - and no way am I going to buy a new PC just to run Windows 11. So installed Linux Mint and I'm perfectly happy!
It's possible half of my problems are because I don't have admin rights, and the other half is because the machine is too weak.
Why do modern OSes need so much power and RAM anyway? I used to produce documents on an Amstrad PPC640. 640 stood for 640k of RAM (no hard disk). It was fine.
I understand the above makes me sound like an old fart (or fool), and we have moved on from DOS. But what does Windows 11 do that Windows 7 couldn't?