Bobblehead,
I am sure that your son threw them very well at a young age and continues to throw them very well indeed. The proof is obviously in his success.
What I am seeing is that young kids are being taught how to throw a c/b, but when it counts and they need a strike out or they are facing a really good hitter, they over throw the pitch or really try to snap it off and mechanics go to heck. That is what I see in every tournament that we play in. We also see kids that throw 90% curveballs and they rarely throw it the same way twice.
This is the dangerous time in my opinion. I would rather have my son over throw a f/b or c/u than c/b before he is fully grown. I am not trying to change your mind. I am just trying to explain my position. I am 100% sure that many people on this site will take your side. People with a lot more experience than me.