I'm a big fan of my Deck, but I think Steam-related software projects always have a distinctive low-level stink.

I use mine on a train that has Wi-Fi with a captive portal and attempting to join it makes the whole UI unresponsive. Using the overlay with a guide in a game always resets the scroll location. These are the kind of things I can live with, but also things I don't expect ever to be fixed unless Valve come out with some wholesale replacement for some overt new strategic goal.