For me Str is the main stat for Tank aswell as Spirit is for healer. Vit & Pie are two secondaries.
I don't see the problem. I'm looking for str gear for my tanks and adjust my vit with my leveling stat points, you know, just to not be oneshoted by some big boss skill. Same for my healer with Spirit and piety. I adjust my piety to be able to dps&heal without asking for break to recover my mana after each encounters, i'm not looking for having the more piety as possible.