If you have the right TV, the right streaming box, and the right receiver (if you use one), HDR looks fine, but a lot of TVs either don’t support HDR or have a really terrible HDR implementation. And then a lot of streaming services either have bad non-HDR video streams or just take the TV claiming HDR at face value and don’t give you a way to turn it off.
I don’t think it’s fair to expect everyone to extensively research and buy high-end TVs just so they can (literally) see a movie or show.