LinuxFire: Don’t buy GOG or Steam, buy Linux!
You have to encourage developers not platforms, but that’s just my opinion.
fair enough.
steam hides their Proton behind DRM while gog allows you to use offline installers and run your games the way you want.
OP, if you want to have game shelf for gog games try GameHub. it supports gog, steam, itch and humble, can import gog tags and also can run windows games with proton (if it finds steam installed) or with wine, can use emulators.
Lutris has similar features but worse tag manager (no tag manager infact).
there's also Games Nebula - open gog client with simplistic design. it has game shelf and gog site tab, ability to run games with emulators, dos or wine. this one acts like a replacement for galaxy 1x.
actually all these apps have better set of features than current galaxy 2.0 - you can add any custom game without an issue, can run windows games, can link emulators etc. and most important - it just works and won't drop your integrations every other day.
gog has no money and no intention to invest into client for Linux. it should be obvious for everyone who saw gog's efforts during last 3-5 years.