But we are training a pilot to fly which may mean a Cessna 150 today a Big engined Cirrus tomorrow or even a twin or larger in the future!!
A 172 is not a bad aircraft and perfectly capable of flying level with approach flap!
Reducing time in the air is another thing which we all do to suit the aircraft we fly and a glide approach maybe one which archives that in a particular situation.
With a glide you are more likely to land long
You are more likely to open the throttle and find a stopped engine!
You are more likely to land fast
You will not have as much elevator and rudder authority compared to the powered approach!
The only benefit I see with the glide approach is with students who in early days need to be kept away from
High AOA high drag scenarios
Yes I see it as an approach especially when you are too high but I see it as an approach not THE APPROACH and certainly not a method for your future flying
Pace