These results are from Ubuntu, which afaik is pretty close to best-case scenario for gaming. It'd be interesting to see similar test done on e.g. Fedora or Arch. It also will be interesting to see how well these games will continue to run in future. My guess is that they will eventually bit-rot and we'll end up using ancient versions of Ubuntu in containers to run the games.

I hope that Snappy/Flatpak/etc would make the situation better once the landscape settles down a bit. The idea behind them seems good enough, and I think this post validates their raison d'être which I have seen people question.