Well if you are demonstrating that to a student then there's really not that much more workload involved in getting them to adjust trim on short final after lowering flap when within easy gliding distance of the runway is there?
Just unnecessary. The late addition of flap produces a large change in the drag characteristics of the aircraft. If there aircraft was already stabilized, the pilot just ruined it. Stabilized is more than trim, it's also glidepath control. The last notch of flaps mainly added drag, so there will be a steepening of the glidepath at the very end of the approach. Not good, IMO.
The attention is better spent focusing on runway alignment, keeping the touchdown point in sight, and a butter smooth roundout
Do you teach big airliner style circuits too perchance?
Actually, my circuits are so tight that in a C152, I can overtake much faster airplanes. I also teach full stall landings and exiting the runway at the first taxiway. And I harp continuously on rudder coordinaton.
So there.
