The way I see things for my Eir and Sieg, if I actually get to the point where I need extra HP on my armour instead of yummy extra "I kill more stuff and thus get EXP and ph@t l3wtZ faster!" STR, then I failed as a player (or failed at mana management in the case of trying to keep other party members alive with my Eir).
You don't need Vit or HP if you're good enough to never get hit.
(and don't need extra mana for Eir if you can find the right times to use Price of Sacrifice) No wonder why I love this game so much more than other MMORPGs.
(note that this is for me. Your own mileage may vary because I am both a freak and a freak with a good internet connection)