That socialization issue is changing, as more and more courses are being taught via the Internet and other technology, and in some cases, students never physically meet classmates or even the instructor.
There are also many theories about education, but two viewpoints sometimes working in tandem and sometimes at odds are that of education being the mastery of a finite body of facts and theories and that of education being introduction to a variety of learning styles, viewpoints, and methodologies, the chief product of which is teaching a student how to learn. "No Child Left Behind" has largely privileged the former, which is also more easily done where social interaction is less critical than memorization. But the give-and-take of the traditional classroom setting often makes developing critical reasoning more possible, if for no other reason than the rapid fire exchange of ideas and nonverbal communication requires students to "think on their feet."