Which brings up another valid point! People can effectively stack one class and not be at a disadvantage buff wise if they had someone grind out the legacy. In my opinion if they're not bringing one of those classes, they should have to HAVE that disadvantage in RWZ's.
which 8 mans are you worried about that would be missing a buff otherwise? yes certain classes are more commonly used but pretty much any optimal set up I can think of has all 4 buffs represented. yes you can stack one class but it would already be suboptimal regardless of buffs.