Thinking about it a bit, it's not a matter of socialization but exposure-- and that applies even moreso to the teacher than the pupil. Take someone who teaches

Thinking about it a bit, it's not a matter of socialization but exposure-- and that applies even moreso to the teacher than the pupil. Take someone who teaches 30 3rd graders reading comprehension for an hour a day, and doing that four years in a row before moving to a different position. That's a way better environment for effective teaching/learning than teaching one's own child by themselves for a single year. Especially when you realize that the classroom has inputs/outputs not only to/from the teacher but among the children as well.