I heard u can't get:
CRIT & DET on Tank gear
Parry on gear that is not Tanks-only (or Vitality accessories I guess)
Accuracy on healer gear since they don't have any and don't need any to heal (100% chance to land a heal)
Mind / Intelligence on DoW gear
Strength & Dexterity on DoM gear

I'm prolly forgetting some, don't remember where I saw that too.