It's a step in the right direction, assuming that it's a significant increase (to 20 yalms or more).
I've learnt to make do with collaborator for tanking, and accomplice only in a dire situation (eg I wasn't supposed to be tanking, but the tank just died). I guess it would be nice to have them on separate timers, or at least using accomplice only prevented collaborator for 1 minute but can't re-use accomplice for 5.