No, I don't think its a matter of having !!!!e instructors. They are just trying not to break the boss's aircraft. They (like me) have probably never had a real engine failure (in a single).
The same can be said when pilots first receive multi-engine training (OEI - one engine inoperative). The first few times you ask (and show) them to slow down gradually - much like at the end of an engine off landing albeit a bit more benign.
Most ME helicopters can't hover on one engine so you use the ground contact to slow you down. But if there is a tree/obstacle racing towards you - do what you have to do and push that collective down as fast as is needed.