Most of us here probably take it for granted, but the sad truth is that the vast majority is locked in the "Steam only" mentality or assume a client+connectivity of some sort is simply inevitable these days.

So let us be glad for every single person who finds that out to not be an exceptionless rule.

I like gog a lot.
The end.

Best? Probably yes; given the fact that most other stores are DRM swamps.
Itch.io is decent too.