...
The point he's making is that armour does matter. Vet 2 armour skirts don't make much of a difference to dedicated tank destroyers, but the Utility Car's armour skirts don't make much difference to a StuG.
Armor buff does not make ANY difference once the TD is vetted, actually a Vet 2 SU-85 has almost 100% chance to hit penetrate a vet 3 Brumbar (or Panther) at all ranges.
The point his is making is the usual, "Vipper you are wrong", just in another thread he was claiming that the higher armor of the M20 make no difference vs small arm fire.
However, those skirts help those tanks bounce T-34s, Cromwells and Shermans a lot, forcing the opponent to spend a lot of fuel on a tank destroyer that contributes nothing to the infantry battle that ultimately decides the game.
Medium tank can simply flank the low mobility Brumbar where they can easily penetrate the rear armor even if the Brumbar is vet 2.
The infantry fight simply does favor Grenadiers who are good at defense but really bad in offense.
If read my post I actually respond to claim by miragelfa:
"Brummbars, however, you're not getting for durability. You get them for reliable anti-infantry firepower. ..."
I am simply pointing out that if Brumabr is bought for durability the vet bonuses need to change.