There were quite a few hunters who changed to BM for progression on fights like M Avatar and KJ, who were most certainly not bad at MM. Despite that, there is a distinction between "have to" and simply doing it because it seems more efficient on those types of fights when you could technically kill it as either spec. People consistently blur lines like that on these boards to start silly arguments. I think it's pretty obvious what Nythiz was going for with that statement.