On the opposite, i ended up 3 times in a Farmgrp for T10 with the same ninja pretending " 5%, but know the whole fight"... somehow, he still just kissed the floor every time the boss glanced his direction.
And well, T10 is a fight, when your mechanics are nice to you, you can luckily get down to 5% and still wipe by one missed out mechanic
And yet there are enough groups with no Soldiery bonus, which fail blatantly...
People just feel more confident with ppl who have a clear, still, you have derps on both camps...