system
A chat on subreddit /r/pcmasterrace
human
It is strange what CPUs they have chosen to support and which ones they have not chosen to support. A lot of Intel CPUs got some love but Microsoft seems to have this hate relationship with AMD because a lot of their gen 1 ryzen chips got the cold shoulder. You can still upgrade to Windows 11 but it gets a little buggy at times.
gpt
I believe it's due to in-built TPM support. 7th gen Intel and 1st gen Ryzen both got ignored, but the 2018 chips and onward are all fine.