Or, should they be taught, at initial rating stage, to go to 300, 400, 500 - maybe even their own (individual) figure - and then improve with time?
Just for interest's sake Keygrip, at the flight school I did my initial twin training with company procedure was you're committed at 400' AAL when OEI. This is a standard figure for anyone doing their initial multi training, however with time an experience will reduce.