You don't play on a 4K TV 2 inches away from the screen.
You're in your couch.
The flaws are much harder to see then.
PC gaming demand extreme sharpness because you're right in front of your monitor.
If you play your PC games on TV it looks great and when you need more FPS you can easily lower some graphical settings, and won't notice much of a difference visually.
Why would you buy a 4K TV then?
You should only get one if it's big enough or you sit close enough that you can actually see the difference.