KA lecture videos were much more in-depth and much more useful than any high school math lesson I ever received.
I mean, Khan is obviously a top teacher, if he wasn't, he'd get replaced by Johnie Academy or whatever pretty quickly. You can't really staff every high school with top teachers, especially if they earn below average wage (that's the case where I live).
It's also a feature of the whole digital format. The lecture can be bugfixed until there are no mistakes left. And have you ever tried telling your high school teacher to rewind 3 minutes and speak 2x times as quickly?
