There are still workarounds for getting new macOS on older not supported hardware (aka the OpenCore Legacy Patcher) which works very well, even with really old macs. But yes, of course, there are no official updates.

That’s not an Apple problem per se though, that’s an industry problem. Windows 11 isn’t officially supported on Devices older than 2018 and unofficially not older than like 2015-ish, if you want full functionality and a non-hacky install (because of TPM 2.0). Also, most Android phones have a notoriously short period getting updates (although that is getting better with some manufacturers promising and delivering way more than before).