nageth: I would not be surprised if there are performance issues with the new SDK for something as intensive as having multiple people interact in a 3D world (Gwent's networking needs are no where near the same).
BKGaming: There are other games on GOG using the Galaxy MP infastructure with a 3D world, see Absolver. A lot of kinks probably got worked out then. Lol
Never said it was impossible. Said why we were seeing a delay. I think you're getting tripped up and over emphasizing my first sentence that I meant to be addressing potential feature differences (I'm purely speculating that Steam and GOG don't have feature parity for their SDK, if they have feature parity I appologize for that). I assume that the Steam and GOG services aren't at the same place because frankly in a lot of places they aren't (see the frequent problems with release day patches on GOG). In the future you might want to use a more apple to apple comparison in your argument because it really sounded like you were saying because a card game had MP a third/first (or whatever it is now) game can too.
Frankly, this feels a bit like Monster Hunter World's huge PC delay. MP is hard.