They were a lot more necessary when each browser threw in fairly random sets of default styling. These days they've converged heavily on the same defaults.
replySurely you must reset something? At the very least box-sizing
replyThe box-sizing property is another way of calculating element sizes but not the default way or the only way. Those of us who were adept at calculating the area sizes after years of doing so had no need for it. Those who are new to the game or can't figure it out use box-sizing.
replyAnd don't call me Shirley