I'd recommend taking a pass on it.My HTPC is intentionally underpowered (Athlon 3000G processor) so it can run almost silently. I was a little surprised to get the offer to upgrade it to Windows 11 yesterday given that the chip only has two cores. Do people think I should jump?
It's a fairly large bloated OS and would probably slow your PC down significantly. Besides not knowing if all your HTPC programs will run without issues on the new OS.
If it ain't broke don't fix it is my opinion in this case.