I just said above they aren't truly open ... so I'm not sure why you're premising your statement on me believing the opposite? But in terms of how they are are

I just said above they aren't truly open ... so I'm not sure why you're premising your statement on me believing the opposite? But in terms of how they are are "more" open, you can side load any app you want, and the headset supports open standards at both the app level (OpenXR) and browser level (WebXR).