This doesnt even cover the multiplayer pain of not having anyone to play with due to lack of cross platform support. Not a dev problem of course, but another penalty to buying from GOG.
Except there are games with crossplay, so if that's missing from a new release it arguably is a dev problem.
True enough, but in the context of this discussion it is usually a feature that is touted and its lack is considered (today anyway) normal. While I am happy to pile on issues, that one seemed unfair in the "Devs who simply ignore GOG" realm. For example, Craft the World gets updates on GOG (albeit always well after Steam, usually months) but there is never anyone online to play multi.