Not interested in owning one of these myself, but thanks to everyone that does - the huge success makes life much better for Linux gamers, general compatibility has been absolutely through the roof recently.
It's only ever revisited after updates when a huge company breaks all their games and valve has shown in the past that they're willing to bend the rules of verification for some high-profile games.
We should ignore it and use protondb instead. You always get the latest comments from people and there is no corporation with a conflict of interest behind it.
While it's unfortunate that the verification process isn't iron-clad, it still reflects a good goal and substantial progress toward it. The fact is, the verification program serves more as a fancy inventory of how their software catalog runs on Proton/Linux and Valve is probably more worried about games people play that are no longer actively developed than it is on fixing every game for every developer.
Personally, I suspect that 3-5 years from now, once Valve has done a complete once-over of their complete library, they'll come back around with a 'premium' version of verified that's more geared toward requirements for current and new games, one which is more focused on working with active developers.
I am yet to discover a game that can't be played on the Deck. Steam Input, the touchpads and the gyro are great at getting a good control scheme for everything. I even played StarCraft on that thing.