The above demonstrates the possibility that biological differences by region can be a factor as I am sure this meetup was not 6 international friends but ones likely live in the same region.
There is also the problem of biased testing without using things like blind testing.
Keep in mind; I am not trying say it is or isn’t a big problem. It is a problem and maybe fixed to a degree with software augmemted ipd offsetting or dynamic correction via eye tracking.
Vr frames with special lenses msy help as well.
Interestingly enough the 60mm seems to be a general barrier in VR atm as the link I posted regarding Vive Pro also lists 60mm from an HTC staff saying screens & optics currently limit ipd.
From my general inet research over the last few days. Grounding down the optics for lower ipds might be way needed & likely only work on something like a wide fov headset due to unique lens shape install would be more consistant than round ones.
But cost vs gains becomes a pickle. With Gen1 on theory they could build 2 skus of hesdsets but the low ipd headsets would cost likely condiderably more & risk more QA issues in gen1 low ipd headsets.