I don't know what you're getting at. Players do improve over time, but shouldn't the best 10 in the country be able to kick the ball into touch reliably (whilst gaining more than 15 metres) by the time has played 25 tests for the national 1st XV?
Nonu's kicking was a good compliment but it was never used as the first clearance option because the 10 wasn't good enough at it.
What I am getting at is exactly in my last reply. Foley is the best 10 by far in Oz at the moment. The coaching in Australia is just not up to scratch and I cannot name a single player in the backline that has improved on their skills from the time they entered the test/super scene to the time they left. My oft quoted example of AAC (Adam Ashley-Cooper) will now be trotted out again, a Pro player who played over 100 tests and he still couldn't reliably pass from both hands despite playing every number in the backline except 9 and 10.
Phipps is the fastest 9 and the best defending 9 in Oz but his passing remains erratic and inconsistent.
Horne has been moved from 12/13 to wing but cannot kick with effect and so offers nothing except a running player and as such has nothing to offer as an exit strategy.
These are professional players who do nothing but train and play yet I find that their base level skills aren't as good as many of the amateurs. Why. I do not accept that they do not have the ability, or the ability to learn (though some will have that limitation just as it is in life) so what it comes back to is lack of coaching and critique and development. The NZ 10s who you laud laso had massive options outside of them to balance their skills and take the pressure, skills are complimentary and in so many instances with NZ rugby the whole is far greater than the sum of the parts.