I am fairly certain that this must have been discussed at some point in the past, however I was not around at that time. So, isn't it somewhat breaking the point of a stair if you cannot challenge someone at a higher step than you? Instead the -3 rule, it should had been something like +2, -3, in my opinion. The way it is, people at higher steps have no motive to challenge those below, and they cannot be touched by those below, either.