> But I sure as hell don't want to invest howevermany weekend days figuring out how to make games from other platforms as easy to play as Steam games on SteamOS.
For games that are licensed under terms that allow it, Debian's Game Data Packager has already automated that work. And- as your comment suggests- a native port is much better than running on a wine shim, which will always be second-rate.
https://wiki.debian.org/Games/GameDataPackager
List of games supported by Game Data Packager: