Different strokes, I guess. One of the main draws of buying games from GOG instead of Steam, for me, is the fact that I don't need an extra bit of superfluous software just to purchase and launch my games. I have a perfectly good application launcher already, which relies on standard .desktop files.

I recently started using the Heroic launcher for my GOG library and so far it's been working great.

https://heroicgameslauncher.com/

They have a launcher?? I've been buying games from them for years and didn't know that..

you have FOSS minigalaxy client as well as HeroicLauncher that support GOG too.