Of course there may be one or two titles that tie you to Windows, or perhaps multiplayer specific gaming related software, but if you are flexible in that regard gaming on Linux is just… good.
I know the wine guys have been doing great work trying to get anticheats working in wine/proton. Hopefully that progresses well. Getting anticheat to work in wine would really be the best.
I ran Manjaro for about half a year recently, including using it for gaming. Very few games actually worked out of the box for me, including games with so called "native" Linux support.
I ran into multiple games with "official" Linux support that were simply broken or became broken by an update. Some of those that weren't broken had significant performance issues (that Windows on the same machine didn't have).
Is it possible to game on Linux? Yes. But at the very least it requires fiddling. As much as I love Linux, gaming is just a lot easier on Windows.
There used to be a way to run Proton outside of Steam but i think it is now discouraged.
I still get screen tearing.
I am running on a laptop, but I typically keep it plugged in as often as possible to save the battery so I haven't noticed if it's good or bad.
It's still a good trade IMO.