One weakness of Valve’s Steam Deck gaming handheld and SteamOS is that, by default, they will only run Windows games from Steam that are supported by the platform’s Proton compatibility layer (plus the subset of games that run natively on Linux). It’s possible to install alternative game stores, and Proton’s compatibility is generally impressive, but SteamOS still isn’t a true drop-in replacement for Windows.
Microsoft and Asus’ co-developed ROG Xbox Ally is trying to offer PC gamers a more comprehensive compatibility solution that also preserves a SteamOS-like handheld UI by putting a new Xbox-branded user interface on top of traditional Windows. And while this interface will roll out to the ROG Xbox Ally first, Microsoft told The Verge that the interface would come to other Ally handhelds next and that something “similar” would be “rolling out to other Windows handhelds starting next year.”
Bringing a Steam Deck-style handheld-optimized user interface to Windows is something Microsoft has been experimenting with internally since at least 2022, when employees at an internal hackathon identified most of Windows’ handheld deficiencies in a slide deck about a proposed “Windows Handheld Mode.”