If you look at the sports world, you will see that its equivalent of tutoring is hugely beneficial and is alive and well. The Williams sisters and their father are one obvious example but if you dig deeper, you will see many more examples. Rafael Nadal was tutored by his uncle. Tiger Woods was tutored by his father. Also, look at coaches. They are often the sons and daughters of coaches. Tutoring allows exploring and…
This is survivorship bias. I've played pick-up basketball with a ton of dudes whose parents sunk hundreds of hours and thousands of dollars into training and coaching, and they're generally stunningly mediocre. Tim Duncan, widely regarded as the greatest power forward of all time, held a basketball for the first time as a freshman in highschool when hurricane Hugo destroyed the pool and he had to pick a new sport to…
This doesn't invalidate your point, but we might get a more accurate picture if we only looked at people who ended up 6'3, strong and athletic.