What they mean by "change the damage calculations of tanks"?

[Ultimatecalibur]

This only holds true while you still need the VIT that the pentamelds provide. Once your left side is upgraded sufficiently to no longer need the extra VIT full slaying is superior.

That does not change the fact that they were identified as the primary reason for FCoB and Alex(S) to be cleared faster than intended.

Well, yes, the total value of primary stats on them is better. I only meant middle of the road in the sense that they provide both some DPS and some HP (but not as much DPS as Slaying and not as much HP as Fending).

I don't see them rebalancing things that way. I doubt Tank max hp will be decreasing, but I do expect the damage gap between full Fending and full Slaying to shrink to something more sane.

Currently the gap when switching between Vit and Str accessories at i210 is an increase of ~30% Str (~770 to ~1000) at a cost of ~25% max hp (20k to 15k). This is an incredibly large increase for what some would consider a fairly cheap cost.