I think you're conflating technical intelligence with emotional intelligence. Letting him work is fine but without being around people his own age he will struggle with emotional growth. If you look at child actors a lot of them become poorly adjusted adults because of this lack of community or peer support. Just like with child actors though, a good family and support system can help them grow to be good or even amazing people.

I do think he is exceptional and should be allowed to do this if he is passionate about it, I just hope that he has people around him to make sure he's not taken advantage of and still has opportunities to experience life with peers, both in age and intellect