I don’t believe that Valve has dropped support for their old hardware. Steam Controllers are no longer for sale but they’re still supported. Valve also expanded the Steam Controller config options to third party controllers including XBox and PlayStation.
Steam Machines may be long gone but Valve never stopped investing in Linux and the tech behind them. You can still build your own “Steam Machine” today with SteamOS. And their Windows compatibility layer, Proton, has been wildly successful on Linux and will be a key component for Steam Deck.
They no longer sell their Steam Link hardware but it was replaced by Steam Link iOS and Android apps and Raspberry Pi software.
I mean “supported” as in “not relying on community support for updates” the steam controller configs are community made. And a button mapping system isn’t what I’d call long-term support.
Likewise, Proton may be fantastic (my Linux buddies say it’s amazing. Side note the distros they use are Ubuntu, Majaro, Nix, and Alpine, so it’s a wide array) but that’s proton, not Linux itself, which they haven’t released their latest game, Half-life Alyx, for.
“Building your own Steam Machine” is by definition, not Valve-supported hardware. No more than building your own PC is supported by Microsoft because you can install Windows on it.
Valve does software. And sometimes they do it well, when they’re focused. But their previous hardware efforts were lacking. That may change with the Steam Deck but I still have apprehensions.
Also, speaking of Steam Deck storage, the basic recommended specs for SteamOS list 200GB of storage. Does anyone else know if the OS is kept on a separate storage partition? If not then 64GB of emmc is a little low.