I agree with most of your points.
But I would argue that in single player games, somebody with an Xbox Series X, plugged in to an LG C9/C10 is going to get a much better visual experience than somebody playing at 1080p on a 240hz panel, unless they are some sort of elite pro competitive gamer.
Not to mention that PC multiplayer games are plagued with hacks and bots, which you simply don't get on a closed system like Xbox or Playstation.
Agreed, I think for that reason the GPUs aimed at low to mid tier are going to have to be much cheaper. The high end is in a category of its own. I hate the botting and hacking on PC, puts me off multiplayer even though I love the competitive online stuff.