Does anyone have any theories on why reviewers seem to experience the VO so drastically differently from one another?
It could well be anatomy or simply people's preferences or perspectives. I haven't watched or read Passion for Sound or Zeos reviews, so this reply isn't about them. I'd suggest, though, that just because some folks set themselves up to be reviewers doesn't mean that they're necessarily very good at it (again, this isn't to comment on the people you referred to).
All too often I see reviewers who don't state what their preferences are or identify the headphones (or other gear) they like, or explain why they like them (or not). This makes it hard to get a frame of reference for where they're coming from. And if someone doesn't have a consistent chain that they routinely use to review headphones, I'll be all the more suspicious of the value of their impressions. Finally, if a reviewer doesn't provide a comparative analysis of a pair of headphones with others, I'd be even less willing to go along with their take on them. In the case of Passion for Sound and Zeos, did they compare the soundstage of the VO with other headphones? If they claim it's poor, what sounds good to them? We need those frames of reference to triangulate where they're coming from.
I won't place any trust in a reviewer's authority until I've heard the same headphones as them and have compared their impressions with my own. If we hear things similarly, I'd be more inclined to trust them. If they hear things differently, I'd be keen to re-evaluate my own perspective. But if our takes don't align, even with a re-consideration, I'd approach their reviews cautiously (or even disregard them altogether).
As for the Vérité's soundstage, I'm not sure where they're coming from. I heard my Vérité with five different DACs* as well as more than 15 amps** and there were seldom any
significant differences in staging. Some, like my Stratus, added a lovely holographic quality and expanded the stage size slightly. But even modest and less appealing amps were fine when it came to staging. Such issues as there were with amp pairings had to do with other things besides staging. For the record, I love the staging of the VO, and I'm fussy about having a soundstage that's open and spacious and free from congestion. The Atrium has a larger soundstage, for me, but it's not as open and airy in its sound as the VO.
All this is to say that you should approach reviewers' opinions with caution and see if you can compare your impressions of gear with theirs. Trust your own ears!
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* Airist RDAC, Bifrost 2, Gungnir A2, Spring 3 KTE, and Yggy A2
** Magni 3, Piety, Massdrop Cavalli Tube Hybrid, Eddie Current ZDT Jr., THX AAA 789, SPL Phonitor X, Mjolnir 1 and 2, Shortest Way 51+, Violectric V281, Ragnarok 1.5, Holo Bliss, Black Widow 2, ampsandsound Forge, and DNA Stratus