Interestingly enough, the not having to undo takes homeschooling kids very far. Very few homeschooled kids live out of touch with the world - they have neighbors, participate in all types of sports, fine arts, academic and other opportunities, work at various jobs or start businesses, occasionally take classes either at local ps or community college, etc.
My dd, for example, volunteers at the local science museum in Philly 1 day a week in an exhibit serving kids from age 3 thru 15. She has to deal with bosses (managers of exhibit), co-workers, parents of kids, kids, groups of school or camp kids, and so on. She knows her performance matters and that she could be asked to leave if her performance or attitude does not meet the standards of the museum. She will be better prepared for life than those who just go to school and participate in school activities, because she will have dealt with life in the real world.
In Philly, where there's about a 5/1 ratio of democrats to republicans, she had her share of getting along with those of the opposite philosophical persuasion last fall. But, get along she did. The difference was, a class grade was not at stake for her beliefs. She learned to speak out when appropriate, and agree to disagree otherwise.
I couldn't agree with you more - there is no one way to educate, just as there is no "one child" to mass educate. Unfortunately, in any classroom, the teacher has to deal with individuals who are all at different levels of ability and with different learning styles. Some kids will do very well under a teacher - others will be profoundly hurt by that same teacher in the same class.