Or it could be cheaper to make. i.e. It's cheaper per unit-airtime to have a small crew interviewing people for backstory (+ editing) than recording people doi

Or it could be cheaper to make. i.e. It's cheaper per unit-airtime to have a small crew interviewing people for backstory (+ editing) than recording people doing the course. They can pad-out the expensive bit (holding the events) with filler/b-roll.