There is some really big news coming from Siggraph.
The Khronos Group has achived a milestone in showing a new StarVR headset running next to a Microsoft MR based one on the OpenXR standard. The presentation is scheduled for 1pm today.
I hope this can be utilized by the Pimax HW as well. StarVR has clearly some lead here being ready with a demo of their hardware.
Ultimately it would be a good thing when all VR gear jumps ship to OpenXR some day, it would ease development and progress in new hardware being supported on an open platform.