Do I need to install “Windows Mixed Reality for SteamVR”? I don’t understand why, shouldn’t OpenXR work with steam? I’m confused about the whole thing…

So I got my Reverb G2 recently, followed a guide on how to use steam, it says to install “WMR for SteamVR” (WMR4SVR), however the more I read is that SteamVR allows OpenXR by default, so why is WMR4SVR needed? Or is it not? I am also confused, if I have WMR4SVR, how do I choose if applications launched through steam use SteamVR or OpenXR? And where does OpenVR come into play? I guess an easier question tl;dr – what’s the best way to set everything up out-of-the-box?

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