This is actually mind blowing. Because in the last six months (I think) there are more developments in this front compared to last six years. Sure, there are little warts and niggles as of now but with this development speed I think we'll have a proper linux systems which can play non-linux games with negligible performance loss.

In addition to proton and steam play one has to add Lutris as well. It makes the emulation of games in wine really easy.