I don't understand how the naysayers of higher education can argue that any amount of viewing lectures can replace legitimate interaction with an expert in the

I don't understand how the naysayers of higher education can argue that any amount of viewing lectures can replace legitimate interaction with an expert in the field. I've taken a lot of classes where I could watch a video of the professor lecture 100 times and be completely lost without the ability to interrupt and ask "excuse me, but how did you go from the base case to the inductive case" or "could you explain that more". If you take STEM classes where the class size is under 40, i.e. upper division classes, you are both able to do this, and you almost NEED to do it. I really don't see people learning operating system design, complex analysis, abstract analysis, circuit design, and organic chemistry, from Khan Academy ...