The 100 degree field of view in the AVP is noticeable because it is a VR headsets. Most VR headsets like the Meta Quest 3 have greater field of view than the AVP, which is why the 100 degree is so noticeable.
AVP is AR. They made a big deal of being able to place windows all around and above your workspace, but taking advantage of this requires large head movements.
I had a Quest2 but sold it years ago. I'm not comparing AVP to any previous VR experiences, I don't even remember what the FOV felt like.
Not the same thing. AVP uses passthrough video, which is subject to the same field of view as the virtual content. These glasses are actually glasses, so the real world has an "unlimited" field of view -- only virtual content exists in the 70 degree FoV.
You can emulate this on the Vision Pro by removing the light seal entirely. It makes a dramatic difference, but also makes it impossible to use virtual environments or any immersive experiences.
For an AR headset, 70 degrees is pretty good.