Here is a solid review of SteamOS 1.6.640 (specifically for the Steam Deck), breaking down the highs, the lows, and the verdict.
If you let SOS install its native skeleton, it will overwrite XPMSE. This causes a visual bug where the anatomy fails to render, leaving a transparent, hollow space in the character mesh. Managing Load Order and Overwrites sos 1.6.640
The story of SoS on 1.6.640 is one of technical hurdles, version-specific DLL conflicts, and the difficult choice between updating or downgrading. The Great Update Conflict Here is a solid review of SteamOS 1