The amount of HP required for the game's current end game content isn't nearly as high as many players would probably believe it needs to be. To strictly say a tank is meant only to tank and nothing else isn't a refusal to think outside of the box. Was full STR practical at 2.0? No, not at all. But as we continue to get more and more patches with different types of gear, our options are slowly expanding. As long as you are sitting at 8000-8500 HP as a PLD, you're fine. As for WAR, 10k is the minimum for some of the other content. There are also batches of content to keep in mind that VIT is completely overkill for. A person does not need all that much HP for extreme mode Ifrit for example.
While it's still not something many PLDs are doing, some are slowly converting to full STR. WARs on the other hand are very much gungho for this sort of idea, myself included. STR meshes very well with a WAR's abilities, such as Second Wind, Inner Beast, Bloodbath(in very particular and rare circumstances), Vengeance, Maim, Storm's Eye, Berserk, etc. WAR has a surprising amount of damage for a tank, and while it's rather negligible, you do get a small amount of parry improvement.
TL;DR: The amount of HP that VIT stacking gives is overkill. We can better help the group by adding damage, additional aggro, and meeting dps checks/bursts.
