From my time in surgery, a) some people accumulate "experience" faster than others --- some surgical residents become facile after doing an operation a dozen times and others take a hundred procedures before they even have a clue --- it's not just a numbers game; b) the sign of true experience? When you realize that you still have a lot more to learn. Surgery and diving both have a way of reminding the most experienced artisans that they don't know squat after all.
Is it me, or do some people consider diving some form of contest? How many dives/year, or per career, how deep, how many certifications... in the end, we are all just floating around seeing what we can see, having a good time and trying not to get stung, bitten or bent.