100% of the gamers that don't overlap with FOSS folks, don't care SteamOS is somehow based on the Linux kernel, the Steam Runtime and a Win32/DirectX translation layer, otherwise there would not be games to play.
Plug a usb dock into the steam deck and you have a “proper” computer.
SteamOS uses Linux as much as Linux distros like Fedora and Arch and other Linux based systems like Android.
A lot of gamers are also FOSS folks although not as hardcore as RMS.
How little do game studios care to port their titles from Android/NDK into SteamOS, even though both are "Linux".
