She feels early entrance would have been wrong for my nephew because he was "immature" as evidenced by frequent discipline issues centered around him goofing off. We have a genuine difference of opinion where I think my nephew would have had less behavior issues if he had been appropriately challenged.
My thinking is line with yours.
I wouldn't even relate "goofing off" to "immaturity" unless the former was getting in the way of his education. If he's got all his work done early, and he's earning top grades, then goofing off is a healthy outlet for coping with boredom.
