as a side note, those extremes are far less likely to happen, as well. the way things are capped in game prevent a character from getting ridiculously high stats in anything, making the roll needed for most things to BE an average roll. of course, there are situations where high numbers are going to be needed, but hey, thats what advantage is for - after all, if you don't have advantage, or worse, are stuck with a disadvantage, then you probably shouldn't be doing whatever it is very often anyway. (of course, that supposes smart, self preservationalists as PC, which almost never happens :P)