At this point I would not be surprised if steam built on top of the deck idea and the support it already provides for fairly responsive and configurable inputs, touch screen included, to launch a steam phone or something.

I mean deck isn’t all that far from having such a device. For the actual phone network stack they would likely just partner up with someone already in the space.

They’ve already had to tackle powering a lightweight portable device with a touch screen and adapting the UX for a small screen and non-kbd input. They’ve already established they can source parts and mass produce a competively priced device.

But realistically I can’t see it being that much better than the recent Linux phone offerings.