As a junior golfer I peaked at 2.4 (probably put in around 10,000 hours, though I obviously didn't keep track), and I agree that being scratch felt much much harder than going from 12 to 2, and +2 seemed impossibly far away.
Not to mention tour conditions for green speed, rough thickness, and length are much tougher than your average very good golf course. My home course at the time was a PGA Tour venue but theyd always close the course for a week to toughen things for the tour event.
For what it's worth, at a 2 handicap I believe you pass the bar to become a PGA of America professional (teaching pros and club pros), pending qualification exams and iirc 2 rounds of play test.