This is one of the things that Valve does very well. I even end up installing Steam on PCs that I run non-steam software on, because Proton is just that easy. I add the shortcut to Steam, choose my proton runtime (if that), click play, and the client does the rest. WHY ON EARTH is it more complicated with other launchers? No idea, and I bet that they have exactly 0 UX people among their midst. And even the programmer excuse doesn't work, that programmers are bad at this sort of thing (think "programmer art"); because programming also adopted convention over configuration in the early 2000s, 20 years ago now.

Sorry for the rant, I also hate bad UX. It makes me feel stupid for no good reason.