Dear @viridian : What the reviewer posted in your last link on the VIV about the kind of bearing is way important. I just today read the link information.
Way before that I posted in the VIV Labs thread something that almost no owner made a comments in my post and what I posted was the excellent damping bearing oil " mechanism " and the arm tube O rings.
All those for me ( I posted a thread about just tonearm damping due to its critical importance. ) could represent over the 70% maybe more of the sound that owners experienced and still experience more than the underhung issue. Damping can easily gives that better dynamic, clarity, definition, better bass performance, etc. etc. even in overhang tonearms designs and always I posted for at least the last 20 years the tonearm critical damping.
I'm not dimishing the underhung idea but my first hand experiences about AS ( even what mijo and other think. ) and due that through the Wally tractor the AS range is ( I can't remember exactly. ) between 9% to 12 " that seems to me not really substantial I can confirm that if we use a good tonearm design ( good damped too. ) if we use it with out apply any AS the " response " from that fact is not only cleary, dynamic and the like but the MUSIC flows as in a live event. I don't use AS and over all the grooved LP surface the imaging is DEAD centered always.
That's really why I don't but the VIV. Again that kind of those to ways of damping are really the VIV: oil floating bearing and O rings.
That's my take and I appreciated that you linked to know that not only me took seriously the tonearm damping in the VIV but that reviewer. Seems to me that almost all owners give everything to the underhung design, well not me even that I'm not an owner.
Yes as JC said: the S and intrinsecal " play " with the AS is the problem down there, so why not NO AS in overhang tonearm. This is me, only thinking " loud ".
Regards and enjoy the MUSIC NOT DISTORTIONS,
R.