Posted May 18, 2021
Time4Tea: Sure, but the OP isn't just talking about soundtracks, but also things like manuals, avatars, wallpapers, which are often bundled with a game for free. Imo, if those are included with the Steam version of a game for the same price, there is no reason for those not to be included with the GOG version.
This was in response to OP's introductory post where they claimed "things have changed for the worse" to note that that's only the case for hardcore fans and collectors. I generally agree with the rest of their statement that gamedevs / publishers should be publishing their priced goodies that are currently on Steam, but not on GOG. And yes, your opinion is reasonable. However, there could be a reason based on a technicality from their viewpoint besides previously mentioned by GamezRanker and Swedrami. Steam and GOG versions will have the same game, but their releases may not necessarily be considered the same product. In other words, a DRM-free game is different enough than its DRM version bundled with goodies and to expect the same price for the DRM-version with free extras is debatable. In retail, product variants will have their own SKU even if they are even slightly different.
GOG does have some influence here in being unwilling to list games without getting the same goodies as Steam, but that could disqualify gamedevs / publishers from publishing on GOG if they can't secure publishing permission, especially when GOG doesn't have that much revenue negotiating power compared to Valve.