This statistic is misleading. They have no way of knowing what people paid for those games. The “value” isn’t just the Steam price.
As many people have mentioned here, most games in big Steam libraries come from bundles. It’s pretty typical to get games for, like, $1-2 each in those. I regularly get 8 games for $10, of which I only really want 1. I play the one I cared about and get my $10 worth. There’s no “lost value” so long as I got my money’s worth from the title I played.
I take an even bigger view: if I buy 10 bundles for $10 each, and get 1 absolute banger (for my preferences) and a few others that are fun for a bit, then I’m happy. I often add 20 new games to my library in a month, and only immediately play 1. That doesn’t mean I have “$400 value of games I’ve never played.”
I played Superhot first on the Deck. Since time only moves (much) when you’re moving, you have lots of time to practice aiming and getting used to track pads/stick + gyro controls. It requires precise aiming, and there are occasional times where speed helps, so it was a good “training” game for me.
It’s still not as natural as KB+mouse, but I’ve been enjoying Ziggurat 2 a lot (on normal difficulty). I won’t push into hard modes, like I would on PC, but it’s working well for me.