Light single engine aircraft have a natural glide slope angle of five degrees or more when set with a trickle of power and landing flap. They are NOT jets believe it or not. Glide approaches can be as much as seven degrees and are perfectly safe.
Three degrees is the ICAO recommended angle for ILS approaches only because that gives a compromise between heavy aircraft inertia and thrust characteristics of jet engines. Teaching three degree approaches in a light twin or single just because one fine day you might fly a 747 is just as useless as driving at 100k in a 40k zone because one day you might be a Formula One racing driver. That said, some bogans drive that way naturally. What puzzles me are flying schools that boast of training future jet captains yet won´t let their solo students wear four bars when flying in command of a Cessna 150.
