Hussar
Legend
Sarcasm aside, that one Fighter can start out only proficient in, say, longsword, crossbow, mace, and dagger while another starts out only proficient in 2-handed axe, spear, sling, and hammer is IMO excellent for character differentiation. It also forces the choice of, when a fine magic weapon is found that nobody is proficient in, whether or not to use it anyway at a non-proficient to-hit penalty.
Except that because the weapons are written the way they are, every fighter uses exactly the same weapons. Specs in longsword, two weapon fighting and shortsword with longbow coming up, typically from the bonus from a 9 Int.
It resulted in far less differentiation.