I used to be a flight instructor and did hundreds of EOL's with students and demonstrated them even in trial lessons if the people were up for them and were properly informed about what was going to happen in fact every time we came back from the local area we did one if we had a bit of wind and werent to heavy.
at the time where I was there was a culture of doing them a lot, it was sort of "rite of passage" to being considered an experienced instructor,and we all were very current.
after flying a few years in a twin IFR enviroment where we never do them cos it is an unneccesary risk to the a/c and we got 2 engines anyway so are unlikely to ever have a double engine failure.
I have come round to the opinion that they should not be required for the PPL, I think a good auto to the power recovery is sufficient and absolutely agree with Gaseous.