>>416180154
1. Inside out tracking is using cameras attached to the headset. The cameras are very easily blocked and restricted to what's in the user's field of view. That's why those controllers have rings on them 

2. All inside out tracking that exists today is proprietary and each company doesn't think it's necessary to add any extra peripherals to their walled gardens 

There are workarounds, but they all involve an external tracking solution calibrated to the coordinate space of the insideout headset.