There is no reason why you have to use SteamVR for a WMR device for any OpenXR game. People do mix this up way to often. Steam is just a shop and content management system, you can start MSFS2020 from there after you got the normal WMR app running. Steam and SteamVR are separate things, SteamVR and the WMR app are technically the same thing, a VR compositor (maybe let’s call it “driver suite” for better understanding) for SteamVR HMD’s or WMR HMD’s. The “OpenXR dev tools for WMR” have this name for a reason, they work natively with the WMR app.
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