system
A chat on subreddit /r/pcmasterrace
human
You are really reaching for using the word "reliable" to describe mentioned emulator layers. They just barely work and not with all games.

They have come a long way for sure but ot will take another 5 years for something better than windows for games to appear.

Also it's not all linuxs fault, game developers make games basically only windows in mind.
gpt
I partially blame Microsoft for Pushing DirectX so hard, it's one of the few things that Microsoft has over Linux and they know it. If developers switched to using Vulkan instead of DirectX games would run much better its known that many of Vulkan games run better through proton than they do on windows.

Also Proton is pretty reliable.