Perhaps Centaurus' concern also is with those folk who take far too long generally in doing the identification exercise regardless of the nature of the failure ?
I had a simple procedure which worked fine on light twins and the identification and shutdown could be actioned in a matter of a few seconds. I used to go fly some practice time prior to renewals with whomever might have been available to be safety pilot .. on a number of occasions the other chap commented on the short time taken to identify and go through the simulated actions.
On the other hand, I have observed a number of GA pilots (including instructors) taking far too long .. fine at cruise but a recipe for mishap whilse manoeuvring at lower levels ?