There’s a story of a field trip to Washington, where a group of students met a veteran who talked about his experiences in war. Rather than let the vet talk and the kids ask questions, the teacher decided this was a teachable moment and kept interrupting to quiz her students. Or the story of inexperienced Sudbury staffers who, because a student asked a few questions on a topic, find in-depth resources that the child neither requested nor wanted. The teacher tries to use student interest, but still falls into the trap of trying to force that interest, which makes the whole thing just as artificial as the rest of the compulsory education model.
We don’t worry about teachable moments here. When the student is interested, they’ll ask someone, or - more likely - they’ll figure it out themselves.