If OST is Free why I cannot have it?
If a Soundtrack is marked as !FREE! I want to add it to my library even if I do not have a MOD in my library. In the Steam store, there are many Game Soundtracks that can be added to the User Library even if you do not have the Base (original) Game! When such an option will be available in the Gog store???
P.S. The best feature that you (GoG) are proposing is DRM-free content aka offline installers to play games. At the same time, you have a lot of drawbacks: slow addition of games (both newly released and old-school) to the store; lack of features in the games that are in the store (Achievements, Multiplayer, Cloud Saves, etc.); VERY slow reaction of support that sometimes cannot help to solve a problem. I like the concept of DRM-free content that you are trying to offer but it cannot cover all the shortcomings of your store.