Swissy88: Soundtrack should have been made available here on release, the fact that it's missing for so long means I'll never buy this game.
Talking in general here - but when something is missing from gog, but is on say steam, the chances are that there are some legal contracts that just make it impossible to have on gog (and elsewhere) atleast on short term. Sometimes the company that owns the game also own the ost rights...sometimes they go to the artists themselves.
Obviously all of us would want to have the same complete game here as elsewhere, but imho its at times unfair to blame the lack of xxx on gog as the chances are they just are unable to have rights for it and its not up to them.
People supporting gog more and gog growing more remarkable market would ofcourse make gog more attractive for companies/artists to go that extra mile and bring stuff over here. But if game sells 85% steam, 14% epic and 1% gog - guess who is going to be looked over?