Have you ever calculated the actual change in VTA that occurs when one adjusts for an "average" LP (in terms of thickness) and then plays for example a 200gm LP or on the other hand an exceptionally thin LP, like maybe an old RCA Dynagroove (they are flexible, so I assume they are thin)? The change in VTA is infinitesimal. If it makes a big (audible) difference to you, have at it. As for me, this is a level of anal behavior that I refuse to enter into. If I am missing something as a result, it’s an acceptable compromise. This is my attitude toward all of my cartridges on all of my different tonearms. Same goes for fussing with load resistors with MC cartridges. I use any value above that which is needed to achieve a ratio of 1:10 or better, between the internal R of the cartridge and the input impedance of the phono.
I found this quote on line, credited to Michael Fremer: "I don't buy that at all [?] nor do I buy changing VTA with different thickness records. On a 9" tonearm you need to move the back of the arm 4MM (that's a lot) to effect a 1 degree SRA change. The differences in thickness between these mats and indeed, between a 120g and 180g record is far less than 4MM and far less than 1 degree. Any differences heard from tiny changes in VTA/SRA are either in one's mind OR due to azimuth shifts that are easily audible and especially true on unipivot arms due to the offset angle..."
I might add also that claimed "improvements" associated with small tweaks of VTA (usually much much less than 4mm up or down) are usually based on snap subjective judgements, hardly a reliable indicator. But again, to anyone who derives satisfaction from tweaking VTA, you have my full support, because this is a hobby that first of all needs to give us pleasure.