@oralloy,
It appears that Windows 11 is an attempt to force people to stop using insecure hardware.
In addition to the requirements for mandatory TPM, no Intel CPU more than 3 years old is approved for Windows 11. No AMD CPU more than 2 years old is approved.
This will exclude most CPUs that are vulnerable to the Meltdown exploit, omitting the need for a software patch that slows down the computer.
They say that are going to keep supporting Windows 10 until the end of 2025 for those of us who can't afford to buy a new computer right now.