Expecting all devs to test their sites with screen readers is unrealistic.
I disagree with this but its not what we're talking about. You said output is useless and I'm saying its obviously not. There's zero cost to using it instead of a div so the only reason not to use it is to purposefully screw users who need accessibility features.
All those other elements give some benefit apart from accessibility
Maybe for label but p and h1 - h6 only differ from div in styles, which is another argument in my favor. If you're willing to swap a div for one of those for visual users, swapping a div for output should be just as easy of a change.
But you know about it now and you're still arguing against it.
The benefit you see in those tags is the same level of benefit that users who use accessibility features get from
outputand 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