A glide approach isnt a standard approach, a powered approach is a standard approach, thats why by far the majority of schools teach powered approaches as standard.
So maybe the standard needs changing?
Do you carry a parachute? Probably not because you realise the risk of having an incident where a parachute would save you are minimal-now apply the same logic to a glide approach and you will come up with the answer.
Aerobatics? Not my bag, but most pilots do. Gliding? Yes. So why not power?
As a matter of interst if the engine stopped for a real during a glide approach that would put you below your idle power glide angle - have you ever considered that?
Indeed.