I think there's way too much "briefing" on the run. Trying to explain to a student even the most basic concepts while airborne, with them flying the aeroplane, is stupid. A recent video I watched included the student asking the instructor what sequences they would be flying during this flight when approaching the holding point, all a bit disorganised. The instructor made some of the RT and used incorrect terminology, funnily enough the student used the same incorrect RT. The "on the fly" briefing consisted of fly by mouth rather than any explanation or demonstration of what was being "taught" - ie turn now (which resulted in just that, no lookout at all!), reduce power, set this speed, rather than discuss the new sequence on the ground, then demonstrate it to the student, then allow them to practice and provide feedback (brief, demonstrate, direct and monitor)