30 Vit gives me about 500 more health at my level and I think there's vit bonuses. It's super useful. If Warriors are awesome because of their high health, then that 30 vit + vit from our shields allows us to reach as close as possible towards that amount that makes Warriors so awesome.

Increase health regeneration, heals that heal by percentages, able to take more hits/more hp to mitigate damage with, great with Iron Skin, honestly, there's more pros than con. 1% block strength won't always help where 30 vit will always help no matter what.

Dying and being revived, 15% health lost, that Vit gives you just a bit more which can makes all the difference. I also never had trouble with hate/threat.