I think number 2 is the biggest deal here.
Right now Steam runs on Linux, and has now reached 3.2% of all Linux users, which is getting too big to just ignore. But that’s 0.3% of all Steam users running Arch, 0.25% running Mint, 0.15% running Ubuntu, and so-on. Say you’re a smallish publisher like Klei. You might want to release your games on Linux, but it would be a pain in the ass to have to do QA for a dozen different distros, each of which is less than 1% of your user base, especially when nearly every box is customized in some way. But, if the Steam Deck and Gabe Cube take off, they’ll have to support at least one Linux distro. That means that if you’re running say Ubuntu, as long as you can get your system to look enough like the Gabe Cube, any game that works well on the Gabe Cube should work for you.
That could start off a positive feedback loop. More games will support Gabe Cube and Steam Deck, so Linux for gaming PCs becomes more and more viable. With more and more users using Linux, making sure Linux is well supported becomes a priority for publishers. That encourages even more people to move to Linux.
Also, for the other points, it might also be something good for families where one person (say mom or dad) likes building their own gaming PC, but 8 year old son isn’t yet at the age where he can build his own PC, and mom doesn’t want to have to build a whole gaming PC for him too. Now you can just quickly add another gaming PC to the house but without having to do significantly more upkeep and maintenance.




Which means anybody with a Linux gaming PC can probably run any game that works with the Gabe Cube. They might have to tweak a few settings so that the game thinks it’s running on a Gabe Cube, but that’s nothing Linux users aren’t used to doing already.