I game on both the deck and a desktop with pop!_os. I can say gaming on my desktop is just as good if not better than the deck for because it can leverage my desktop hardware and it’s way easier to go under the hood with proper peripherals. Linux has come a long way with gaming. Most of the shit that doesn’t run on linux are games that cost too much for too little content or they’re just gonna be battle pass/cosmetic farms that cater to whales and aren’t actually fun in any sense of the word.

If you’re gonna be a top 0.0001% competitive gamer, you’ll probably wanna stick to windows. If you don’t play FPSes competively, a linux based gaming PC is probably fine. Me? I’m a middle aged dude with kids who racks up about 20 hours a week somehow, and linux more than suits my needs.

I’ve had more success with Lutris and Wine in getting certain abandonware games (Black and White for example) to run than I ever did on Windows.