I find KDE connect to be both useful and interesting to use. It’s not really recommendable in and of itself but it makes connecting between your various devices very effective, like file transfer, clipboard sharing, remote control etc.

With regards to casual gaming, I personally don’t have anything to recommend because that’s exactly the kind of game I try to avoid. I like involved games, interesting, with a story, a purpose, requiring thinking and such. But what I can say is that the steam deck is so effective with its sleep functionality that you can very casually play any involved game no matter how much time you have.

It is so easy to be back in the game: I’ve played the witcher 3 a lot (highly recommend it if you have not played it) and it is a very involved game, but I’ve been in and out for even just a few minutes thanks to sleep. It takes one second to be back in the game fighting some enemies and takes a second to pause the game and put the console back to sleep in my backpack. You don’t have to restrict yourself to casual games to benefit from casually playing, with the steam deck.