Are you talking about real support or official support?
Official support, yes, they dropped a ton with Windows 11, they didn't drop any with 24H2 for upgrades I don't think. Only for new systems. But if you have, say, an Intel i5-8xxx, you still get 24H2 just fine. Whereas a 7xxx has never been offered Windows 11 and the installer will tell you to get lost if you don't add some registry keys to bypass the CPU check.
Unofficially, the baseline for pre-24H2 versions was the 45nm C2D/C2Q, 24H2 requires an instruction that was added in... Nehalem?... I think. I have run 23H2 on a C2Q Q9650 and 24H2 on an Ivy Bridge in BIOS/MBR mode too, both actually work just fine.
This is part of what makes me so angry at Microsoft. At least when Apple drops support for something, they actually remove the code and the OCLP people have to add it back somehow. Microsoft left all the standard NT 6 code still there, but just put these additional checks in the installer at the last minute.