The Deck has been such a revelation for me, I love it and it has entirely replaced my PC and PS4 (although I do still want to set them both up so I can stream from them, I haven't felt the need to yet). I hope the concept is here to stay and that when I'm ready to replace it there's something at a similar price with similar relative performance.
Between the pandemic lockdowns and having a kid over the past couple of years I've become very aware that time pressure has a huge effect on how I choose what to play; if I have all the time in the world I'll play anything, if I don't then I don't want to waste time on stuff I'm not sure I'll like. That said, I have always believed that you have to take the rough with the smooth; bad stuff makes you appreciate good stuff and the same is true of games, I personally believe that playing bad games is a good thing, in moderation at least, but now that I'm back at work and I have a son, without the Deck I would be right back to where I was in 2019, even more squeezed actually and thus highly motivated to only play what I know is good.
With the Deck, though, I haven't felt the need to either carefully pick what I play (by searching for ages for "the perfect game") or do the complete opposite (choose to not choose by playing one of the handful of games I've already played to death), although this in itself has led to a little bit of choice paralysis because I own hundreds of games that are all on even ground now.
In fact my biggest criticism is that for people with a large library like me, it's kind of hard to know what you've got. On my desktop I can see my games either as a long list or a grid of box art, the Deck only supports the latter and the clunky interface means I just don't really want to deal with it, so - and maybe this is deliberate (it isn't) - I just want to buy new games all the time because it's easier than poring over the games I already have, although that's also partially motivated by the fact that so many of the games I liked the look of were games I knew I wouldn't want to play on my desktop, and now that barrier is gone.
All in all though, I don't think I've ever in my life played such a variety of games, bouncing from Gris to Frog Detective to Car Mech Sim to Killing Floor, etc., it's just great.