And one more thing I'd like to add, from a perspective of a low-timer
Even with the little experience that I've had so far (training for my Instrument rating now), I got to fly and study with some different people. And from what I've noticed, at some point in their training most pilots have very similar flying skills (i.e.
"anyone can be trained to fly an airplane").
However, what does seem to become more important as new pilots advance in their training is their personality, character and decision-making skills. Some people have great stick and rudder skills, but aren't able to interact with the other pilots that they fly with. Some handle emergencies better than others. Some take it to the limit to show off. Some don't think that the concept of CRM is worth studying since it's a "bunch of nonsense, let's just go to the sim and do some spins". Some get complacent as they get overconfident when flying an airplane.
How much time is enough for someone to fully realize the responsibility that comes with getting a certificate and a right to fly an airplane? Seems that 1500 hours won't do it for some people, and may be way too much for others..
Just IMHO.