Strength Tanks and You.

[Hundred]

Then what was the point in that extra HP to begin with?

The actual reality is that overhealing is typical. If you heal a Vit tank and a Str tank the exact same amount of times for an encounter you'll eventually get a free cure due to the extra health from overhealing.
Health regen is also based off of your maximum health, so a Vit tank has higher Health regen per second then a STR tank.
This can all be trivial or it can be relevent.

The debate is largely nonsensical regardless. Tanks deal their necessary damage just by properly holding hate. Tanks doing insufficient damage lose aggro to competent dps.The Extra Str of a STR tank has the ability to make the content go faster.
If someone fucks up however then you lose the entire speed advantage so the performance of the players is key to making this run correctly, Vit builds have a notably larger margin of error and have significantly higher effective health.

Given I play the tank I only have to concern myself with 1 other tank but if I were the DPS or the healer I wouldn't really give a damn which one so long as we completed. I remember an A2 run Im in full str the other tank is in Hybrid gear. Should I go "Your hybrid gear has a bunch of unnecessary vit, and you have less str then me get gud"? Nope, it doesn't even matter.