Yes I get that, for example read dead redemption for Xone X that was more than just higher resolution and etc.
The point is that games will always run at the maximum resolution and fps as originally designed. AGain using GTA4 as an example, even on XSX in theory it will run at 720p 30fps, of course loading times will be crazy fast, it will never drop below 30fps and probably a few other things will get better.
But as far as I know, to run it at a higher resolution of fps it's something that depends on the developer and I think most o them will not be interested in that as it requires time for something that will not bring more money in, and also kind of kills opportunity for future remasters.
My hope is that XSX could do it without the developer, just like a pc game you know? Microsoft internally just deploy an option to run the game at a higher resolution or fps. But again, I dont see that happening unfortunately.
A checkboarding option to the emulation could potentially achieve this.
But it will never be a 100% solution. But the majority of games should at least look a little better, and run a little better at the very least.