ValamirCleaver: I would prefer GOG to use their resources to continue to offer more DRM free games that are downloadable and installable & patchable offline without mandating the use of a proprietary client instead of wasting these resources reinventing the wheel (chat) for the "umpteenth" time.
Doing what they do already is not losing resources, that's stagnating - and stagnation is not good for business, to my understanding anyway.
ValamirCleaver: As I posted above, multi-protocol chat clients have existed for about 20 years, why reinvent the wheel yet again?...
Because a protocol doesn't automatically gather a community around itself. I can push Jabber up my colleague's noses all I want, but I don't have to, because I can already find them all on LinkedIn. I can try to get all of my friends on TeamSpeak for gaming, but I don't have to, they all already have Steam installed. Well, if I want to get the 'old group' together, I would not have to lift a finger if Galaxy had proper communication integrated - as it stands, I got two more people on Steam 'cause it's easy to use. Besides, GOG doesn't have to reinvent anything whatsoever - you said it yourself, there's more than enough communication protocols ready to be taken advantage of, by GOG or anyone else.