The teachers are products of the system so their only fault is not being able to break free. Like you said, those that do must work against the rules. I don't think most teachers have the chance even if they did understand to teach individuals completely, that is why I think that they should teach to the point the children can teach themselves. I don't think the lessons ever need stop either.
My father was a teacher his entire life from 16 to 81 this year and still going. If anyone went to a school he taught at, they know him. He taught life within the bounds of the system allocated and was appreciated greatly for it. I am glad I never had him as a teacher though my brothers did.