the main reason is because people don't know about it

But you know about it now and you're still arguing against it.

it's an extra thing to remember for little benefit the "only" do a really useful thing that lots of people want.

The benefit you see in those tags is the same level of benefit that users who use accessibility features get from output and other semantic tags. But your argument seems to boil down to "I dont need accessibility features so i don't care about enabling them for ppl who do". That's very disappointing and continuing this debate seems pointless so i'm gonna stop here