I tried out Age of Empires mobile.
It's very mobile-gamey, filled with in-your-face micro-transactions upsells and pay-to-win.
The historical character heroes are fun.
I think it scratches an itch if you're bored with time to kill. Lacks depth, I will stop in a few days.
Never played a lot on mobile. But I 100% stopped once I got my steam deck :)
I have heard good things about Steam Deck, but hadn't considered buying one. I have many Windows-only games, but I'm not eager to sit at the desk for long periods.
There is a good chance a bunch of those games work well on the Steam Deck. Depending on the type of game the controller can be a good fit or not, but many Windows games just work out of the box