Outside of self learning and higher education, I cannot see even the best recordings being anything more then supplementary material in education. A good teacher is able to shape a lesson in preparation and during it's delivery to meet the needs of her classroom/students. A recording can be used to deliver a high level overview, but it will require reinforcement afterwards by the teacher. Why not just let the teacher teach and reinforce where needed during the delivery?
>A good teacher is able to [...] Why not just let the teacher teach [...]?
By adding a qualifier such as "good" as in "good teacher", you've (inadvertently?) made your argument look more reasonable and correct. Some teachers are good, most are average, and many are bad.
The gp you responded to is talking about superior teaching recordings to help the teachers at bad schools. (But it can also help the good teachers by letting them put more energy into the 1-on-1 phase of instruction.)
