I know, I have many of them. Most of them I specifically bought when they got Linux support, like Tomb Raider and Alien Isolation.
Not a single commercial game runs as well natively as it does through Proton. Tomb Raider - has much worse graphics. Alien Isolation - for some reason the DPad doesn’t work. Baldur’s Gate - I have to supply some old openssl (or so, can’t remember) library. And I shudder at the thought of trying to get Unreal Tournament 2004 or Doom 3 (not the open source version) running. I should try to dig out my disc for Ankh to see how hard it is to get that one running.
Maintained games and especially open source ones run great. But the sad reality is that it costs money to maintain software. Linux backwards compatibility is abysmal. It is much easier to get a 20 year old Windows game to run than a 20 year old Linux game.
Though to be fair, it is also hard on Windows to get a 20 year old Windows game to run. Wine is just a great piece of software.
I would love to have more native games. My own game is native as well. And luckily most indie devs usually also bring out a native port. And still most of the time the Windows version via Proton just runs better.
At the moment there are automn holidays for school children in Germany. But at least adults could just take a vacation at more or less any time. And going in autumn should give you the true English experience.