One of the big problems confronting a pilot in an actual engine out, is getting
over the shock of the reality of the occurance. Some pilots (people in
general) will "choke" or mentally freeze up and not think constructively about
dealing with the situation. ( 'I can't believe my engine quit!' syndrome)
Constantly training/practicing/"rehearsing" will help a pilot get past this
hurdle. By knowing what the next "planned" move will be. That's part of the
value of regular practice.
VL
(Oh gawd, he's on his soapbox again)