Looks like pilots just swallow whatever they are told during training even if sometimes it’s wrong and don’t bother to crosscheck the information in the books.
Or don't open their minds and apply a modicum of sound airmanship. There will be many FOM's that have ambiguous grey areas where that MO has to be used, regularly. Sadly it is becoming less & less and then those who are dependant solely on 'the books' are left floundering when the answer found is not black & white.