The gamepad I think would have been the killer device. Look at how much attention the steam gamepad gets. Sure, I have two gamepads already and I use them to play games on a dedicated (framework) computer hooked up to the living room TV. But guess what doesn't work? Turning the computer/TV on with the gamepad. It's so small, but so frustrating, also anytime the screens go off or sleep. So I have to keep a little $10 wireless keyboard there to turn the TV on / wake the computer.
My understanding is this is what holds it (and all other gamepads) back: https://github.com/FrameworkComputer/SoftwareFirmwareIssueTr...
Steam is going to get there by having both the gamepad + the computer which then makes it possible to workout the various TV implementations.