Have not checked GoG galaxy lately, but maybe it is my stockholm syndrome. But other stores do not really feel better. That is Epic, Ubisoft, Xbox... Haven't checked EA lately, but that was also a mess flipping between Origin and EA something...
Seems, like simple efficient store and download manager should be solved issue. But what do I know...
Yeah really Steam continues to succeed because everyone else is so bad at it, and the smaller players don't have the benefit of getting in early. Epic and Microsoft are maybe the best positioned to pull if off, but they've done a lot of fumbling so far.