My daughter’s pitching coach was just telling us how pitching lessons were not a thing when she was growing up and she had a book from the library and practiced a lot. Her college career was at the very end of the 90s/ early 2000s and was quite successful.When do you think lessons actually became a thing? 80's? 90's? Lessons (for any skill aspect in sports) more than likely allow a quicker (but more expensive) path for great athletes, who would otherwise probably figure it out on their own. Mickey Mantle learned to switch hit against his RH father and LH grandfather throwing tennis balls at him trying to strike him out...For mere mortals they probably allow for success that wouldn't otherwise have been found...