It did back when judges knew how to score Fights.
But the system was also lost when a lot of the old trainers passed on, and never had apprentices. You can see whose apprentices passed the test of time now. Nazim Richardson was Bouie's apprentice. Futch had both Roach and McCallum, Roach with more notoriety of course. Nobody really followed in the footsteps of Georgie Benton that I know of, but Steward has Joey Gamache right now. D'Amato had Rooney until he got into poor health, but more importantly he had Atlas, who still trains guys. Atlas has Michael Moorer, who despite his personality problems, is actually a pretty damn good trainer. And even Floyd Jr. has trained some younger guys and is pretty good at it.
It's all about the know-how of coaching being passed on. But the Sport is FLOODED with watered-down versions of guys who only know how to teach you how to punch. Not how to box. MMA is even worse-off because it's also filled with the guys who couldn't coach Boxing, who don't even teach how to punch right. Guys like Howard Davis and Skipper Kelp (and Robert Garcia) being exceptions.