What makes SteamOS so great is the fact that it is a console-like experience for a PC, which means you can turn it on and everything is instantly available to you from the comfort of your couch. However, it's still a PC, which means for those of you interested in going further, you can customize it with pretty much anything you can imagine that runs on Linux, which unlocks the potential of it far more than any other console will allow. Because the Steam Deck has been out for several years now, people have been tinkering with SteamOS for a while, and there are a lot of options available to you. If you want GOG, you have to pay an additional $6.
Источник
GameSpot