What if I don't want to use windows? What if I find windows to be buggy and unstable and all around just unpleasant to use? What if I don't want to have to reboot my PC or my deck every time I get the slightest urge to play shitty simulators or one of the millions of backrooms games?
You need the binder kernel modules such as binder_linux which aren't included in the SteamOS kernel as well a needing to config up systemd services, etc.
Updating SteamOS will break all this do to it's image based "immutable" nature.
just because doom runs on everything not every software needs to run in any environment. it's a shitty move to actively break working things but in the end they are not obligated to anyone but their shareholders. and if they think that is what they need to do then let them.