Hi, I haven't read the whole thread but I thought isn't all you about my own experience.
As a child, I was pretty much like your son in that I learnt to read very young and I absolutely adored books. I liked nothing better than books and would read for every minute of every day if left to my own devices. As a result, I simply didn't spend long enough playing (particularly with my peers) and looking back, I don't think I developed socially quite at the same rate as other children. I'm perfectly fine on that level now, but it took me far, far longer to get here than most other people.
Being less sociable as a child wasn't good. I can see how I might have been seen as a little different, because I had different interests to other children (didn't like playing with dolls or doing anything sporty, for example). This made me avoid social situations and retreat into my reading even more. I felt very inadequate, actually, and was quite an unhappy child because much as I tried, I couldn't make friends easily.
My parents (both university educated) actually put a limit to my reading time and I can see why. Social skills are certainly as important, if not more (In my view), than intellectual ability. The ability to relate to others, to make friendships easily and basically to feel in control of social situations is, ultimately, what makes people happy. In other words, having well-developed social skills will set you up in life (at a personal as well as professional level) in a way that plain intellectual ability simply won't.
For what is worth, I stopped reading so compulsively once I start fancying boys
. My focus shifted to that sort of thing and tgat helped hugely. Today I'm happy to report I'm perfectly well adjusted, but I "matured" socially much later than my peers.