Currently reading this thread on my Deck (and typing. The brand new split keyboard is awesome!). I'm a week 2 recipient, so I've had a couple of weeks to test it out. This thing is going to be enormously popular. I've never owned anything that has garnered this much intrigue and excitement from so many random people. Also, keep in mind that SteamOS is poised to be used in a product category, much like the experimental OS I remember was installed on my old G1 phone... oh, what was that odd OS called with the app drawer and the pulldown notifications? Ah, Android, that's right. But who would want to develop for a Linux based phone?
I'm playing around a bit, and clearly bringing my biases with me. I mostly wanted to drop in and say that a vast library of Windows games are working very well through proton. If the team were to test out Launchbox and BigBox on steamOS 3.0 and redirect the file system to the appropriate destinations then it might be all that needs to be done. The attention garnered from an official release, and possibly listing the free version on Steam would most likely pay for itself. Just look at Dbrand already making money on the Deck accessory preorders.
I think it's a scene that's worth being on the forefront of. Just one biased fanboy's take.