Oh, no, I'm talking about Windows native handhelds, which may be getting SteamOS support in the future, as per the original post.

I think a lot of people (reviewers included, weirdly) assume that you need to navigate those with a mouse replacement every time, so you get a lot of complaints about how bad using Windows without a mouse is compared to Steam OS on Game Mode. But you can absolutely set up Steam to a) autolaunch on boot, and b) launch straight into Big Picture mode. At that point once you unlock your Windows handheld you're straight in the Steam fullscreen mode interface and can do everything (within Steam) with a controller.

Not that I think tapping the Steam icon to manually open it up is that much of a hassle, anyway.

I do have a Deck, but they never made good on their early promises to make it easy to use with Windows. Which they did make, I remember. But nope, if you have a Deck you should probably stick to Steam OS. Valve should just find a better way to integrate third party launchers.