Buggered if I will teach students to use 40 deg Aob turns as a general course of action at low level. 15 is usually fine and 30 if required to tighten up the turn onto final.
If they need more than that, then they aren't anticipating enough or haven't read the wind correctly.
I didn't say it was a steep turn, just bordering on.
Quote the CASA Flight Instructor's Manual, Turning;
MEDIUM LEVEL TURNS
Definition A medium turn is one carried out with an angle
of bank of approximately 30 degrees.
And that's the way every school I've taught at does it.
PS. None of them taught a 30deg climbing turn, either.
Again to quote the CASA Manual;
Point out that the angle of bank is restricted to only about a rate
one turn, otherwise the rate of climb is decreased markedly.
Unless you're flying at 200Kts, Rate 1 is a lot closer to 15deg than 30.
My point was that teaching a student to fly at excessive AoB's at low level in the early stages of their training might not be such a good idea.