Not on a steam deck, but I did buy another PC based handheld.

As a Dad with a somewhat demanding job, I don't get a lot of time on my gaming PC anymore. Having something that's not squirreled away in a corner that turns on/off quickly has made it a lot easier game somewhat more casually.

I'm generally happy with the performance of my handled, but there is some tension between most of the steam games I'm trying to play on it and the realities of a hand held.

For example, many games on steam are designed for larger screens. Sure, they'll render fine on a small screen, but things that were very obvious on a large screen can become harder to spot because the game designers could assume more real estate.

I also find myself gravitating toward games that were either built for a console or PC games that don't require a lot of keyboard actions. For example, I'm presently playing through the original Borderlands after having last played it on PC quite a while ago. I don't think I would attempt StarCraft II on my handheld though.