My experience with upgrading gaming pc to windows 11 (AMD cpu, nvidia gpu):
HDR is glitchy (enabling it is fine, but after I disable it colors go crazy, its like 8 bit depth?)
Motherboard chipset driver went bye bye (had to reinstall manually via msi, works again)
Had to clean WU (wasnt able to detect preview stuff?)
Defender is gone. had to restore it with powershell lol
Still cant see the seconds on the clock 😦
Still cant open task manager from the taskbar (displays only taskbar settings option because of unknown reasons)