Workshop is a built-in mod store. Input is controller remapping and emulation (typically used to play older games that don’t support modern controllers, or controllers at all). Remote is exactly what it sounds like (run a game on your powerful PC and stream it to your old laptop or phone).
Those things are the responsibility of the client software, but on all stores except GOG, the client software is also the store client. You can’t (normally) run games without the client. GOG has a client (Galaxy) but it’s nowhere near as advanced as Steam.
Workshop is a built-in mod store. Input is controller remapping and emulation (typically used to play older games that don’t support modern controllers, or controllers at all). Remote is exactly what it sounds like (run a game on your powerful PC and stream it to your old laptop or phone).
Those things are the responsibility of the client software, but on all stores except GOG, the client software is also the store client. You can’t (normally) run games without the client. GOG has a client (Galaxy) but it’s nowhere near as advanced as Steam.