Well, if the current situation, like many say, is that WAR is not viable for the real end game content, ie. Coil, what does putting your points into VIT to buff your HP pool help? It doesn't matter if your HP pool is 5k, 7k, 15k, if the main problem is that healers cannot cap your HP because the bonus to healing is too small or alternatively that even if you cap your HP, you still get hit too hard to survive. Paladins are easier and more efficient to heal, but having a bigger hp-pool does not make a WAR any easier or more efficient to heal. There is simply a larger margin of error for healers.

So in content where you are viable to begin with, having higher hp pool simply allows healers more laid back gameplay, while foregoing that small bonus you would get speccing your stats other ways. So if you are content in your healer and hp-pool for the content you are doing, having 500 or 1000 more hp has no consequence.

What I am trying to say is not that STR or VIT is superior. Simply that in current condition that WAR is, stacking VIT does not have much value for the content that you are deemed viable (by popular opinion) anyway.