Yeah, man, I have a bunch of Windows handhelds and both Deck models. I... may have a problem, but I know how it works.

And yeah, I do realize that the Deck and SteamOS game mode doubles as an attempt to complete Valve's dominance over the PC market. I just think that sucks. If GOG can allow you to integrate Epic and Steam then so can Steam. And until they do that, the Deck is less useful to me than a Windows handheld because I keep as much of my gaming library as possible within GOG.

For the record, your posts kinda misrepresent how Big Picture works in practice. Like I said, yeah, you can't change power and screen settings (and bluetooth) directly on Steam, but most Windows handhelds have a shortcut button with those options in it that is, let's be honest, just copying the Steam version. Depending on your brand it is more or less useful, but it's not like you have to whip out a mouse to do those things. I still think most of those implementations are worse than SteamOS's fully integrated version, and Big Picture over Windows is overall a bit laggier and less responsive... but I mean, it's close enough and it absolutely beats being cut off from several thousand games.