Steam already supports 3rd-party controllers and VR headsets. SteamOS is available on several 3rd-party handhelds. What more do you need for "steam compatible hardware"?
Do they support any third-party controllers that are anything like the Steam controller(s)? To my knowledge, third party support is only for traditional game-console-like controllers.
Do they support any third-party controllers that are anything like the Steam controller(s)? To my knowledge, third party support is only for traditional game-console-like controllers.