Disk encryption, Windows Hello and PIN bruteforce prevention. I have no love Microsoft and avoid using Windows whenever I can, but I think making those features accessible to more people is a good thing.
https://learn.microsoft.com/en-us/windows-hardware/design/de...
https://techcommunity.microsoft.com/blog/virtualization/virt...
If you have an older computer, without TPM 1.2/2.0, then you already don't things like Windows Hello, but you might have secure boot and some brute force prevention, so you wouldn't be worse of as a home user if Microsoft allowed you to run Windows 11.
For new computers I can completely understand that Microsoft would demand that vendors ship systems with TPM 2.0. For upgrades I just struggle to see any really compelling reason, it's not like Apple where Microsoft is trying to also sell hardware, that's mostly on the OEMs.
(Personally I think you probably shouldn't bother with it unless you set a boot PIN, which still requires Pro to be allowed to change the right group policy settings.)