I actually think Free bird is making a good point even if I don't really like HOW he is making the point.
The Chinese often do hold kids Harimoto's age from too much international competition until they are a little older and their fundamentals are a little more complete. Exceptions to that are players like Ma Long and Fan Zhendong and even when those two started playing, their overall game was a little more complete in a certain way: read: more power on FH. And I am not sure the CNT let either ML or FZD play Tour events before 15.
But I am not 100% sure what would be the best way to develop Harimoto into the best player he can be. He is so young and I really don't think there has been anyone who has played as much on the World Circuit at his age. And certainly nobody had the kind of success he has had at such a young age.
But we will see how he develops. I think, for a 14 year old he is pretty darn amazing. But I can imagine all sorts of scenarios for him: some include him becoming one of the best players of his era; or, his technique flattens because of how much he plays close to the table and how he doesn't have the power to play mid-distance power loops, and as he gets bigger, older, stronger and slower, he stops being able to play the woman's game against the men because of the loss of speed and reaction time; or it could go even further the other way where he gets burnt out from all this exposure at such a young age and just stops playing.
I actually know a woman who was on a Euro National team and when she was 19 she had one lots of titles and got sick of TT and just stopped playing for 10 years. She was a prospect to be a top European woman and she just flat out quit playing. All that stress can do a number on a kid. So, I do hope that doesn't happen to Harimoto.
And I think, perhaps, some of what I just described might be what Free bird is focused on.