You cannot.
Tier 2 warrior gear will probably have similar HP (maybe a bit less) as a mix of t2.5 / pvp gear.
rogue t3 has like 500-1000 less hp than in pvp gear mix, and a tiny bit more than t1 or t2
Yet all these things do massively different amounts of damage, have way diff survivability, and thus should be handled differently.
Why in the world would we ever harm pvp by taking away that information???