F1
Now you have 1500 hours (as an instructor?) would you say that at graduation and 250 hours you were just as capable?
My point is that I know that I still had to think about flying the aeroplane when I had 250 hours, let alone all the other thought requirement when flying an ILS down to minima on a complex jet aircraft.
With 1000 hours I can fly an ILS without thinking so much, leaving my brain to think of other things like calling for prelanding checks!
When I did my non approved IR, I flew with guys who were at the end of a CAP509 course. You could see that there was a high level of thought going into to the handling side of the flight leaving little spare capacity.
At 1000 hours there is considerably more spare mental capacity.
Having said that, a great number of CAP509ers go onto to medium size jets and perform extremely well. Que faire?