I tried to push for GOG purchases too and then I just ended up with games that would receive updates late. I'd miss out on discounts and bundles that make future purchases cheaper, at some point it was cheaper to just rebuy stuff with DLCs on Steam than continue building up the library on GOG.

I also gave their galaxy client a try since it promised a united library for all platforms and then they did a horrible job managing the plugins for other stores - they constantly kept breaking or logging me out while even Playnite worked perfectly out of the box.

In the end I just stopped wasting energy on GOG, life is too short and complicated enough. If they have a good deal on old games I might grab it, otherwise I prefer anything else.