Hmmmm
All interesting stuff! However, (PPL here) aren't you supposed to teach us why we apply carb heat, why we should select cold before power and why we need to understand the principals and not to simply refer to the POH without knowing why we do the things it tells us?
Most of the aircraft I fly have no POH because they are PFA type home builds.
It is only through understanding why we do the things that we do that we can make informed decisions over how we do them. Isn't that your job as instructors to do? If not then we just as well simply go along assuming anything written down in manuals, text books or (dare I say?) POH's are always and infallibly correct?
SS