Full-screen Xbox handheld UI is coming to all Windows PCs "starting next year"
Briefly

Valve's Steam Deck gaming handheld, while impressive, faces limitations due to its reliance on the Proton compatibility layer for running Windows games. The ROG Xbox Ally, developed by Microsoft and Asus, addresses these shortcomings by introducing a new Xbox-branded user interface on Windows, which offers a more comprehensive gaming experience. This interface initially rolls out for the ROG Xbox Ally but is intended for other handhelds in the future. Microsoft has been developing handheld-specific UI optimizations to enhance touch screen usability and controller support.
One weakness of Valve's Steam Deck is that it primarily runs Windows games supported by Proton, lacking comprehensive compatibility like the new ROG Xbox Ally.
Microsoft is experimenting with a Steam Deck-like interface for Windows handhelds, aiming to enhance gaming experiences by addressing Windows' handheld deficiencies.
Read at Ars Technica
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