Most of my stuff is on GoG. But I'd rather have bought EE trilogy on Steam since it has achievements.
But for BG3 I don't think it'll play any different if you launch from Steam or GoG.
huh. It's odd that they didn't enable achievements on GOG. Not that I care.
As I said - irrational.
Still, I assume it will come to GOG. It has GOG page, and D:OS2 EA was on GOG as well I believe.