Doing it at 3000', practicing aeros or spin recoveries, is very different to deliberately killing the donk and trying to glide the bastard in.
As a student my CFI had delusions of Hoover and used shut down the Decathlon at 4000' over the field, do aeros all the way down to 500', land and taxi in to the school. One day he misjudged the winds and couldn't restart the Donk... we all had to go out and push him in from the end of the runway.
Another fella I know was doing a checkout in remote NW Ozmate at night.... the Chief pilot failed the lights on him. He was trying to hold the torch in his mouth etc etc etc when the chief pilot pulled the mixture... and a Cessna 206 doesn't glide real well!
The Chief Pilot was promptly told to get knotted and J. restarted the engine, landing without incident.
As Col Pay says, "Why turn a practice emergency into a real one?"