>>392075781
>No, because they interface with SteamVR natively,
Performance actually CAN be better, because SteamVR is a buggy garbage. It is indeed also the driver for index, but I wouldn't be surprised if the driver is also mess. I don't think it is possible to bypass SteamVR on windows if you use index, but for linux there is Monado.
Someone really needs to test "OpenXR game through SteamVR" against "OpenXR game through Monado" and compare performance, just so we can see the absolute state of steamvr.