I think precautionary landings with power which I assume you mean off- airfield (otherwise it would just be a normal landing) will never be taught in this nanny state of ours for the same reason that actual spins disappeared from the PPL syllabus: The potential for serious sh*t happening during the event outweighs the potential risk of spinning in the first place. Hence spin awareness only is taught.
The exact parallel to a precaurionary landing with power would equate to a kind of PFL, but maintaining power to a very low level.
Then the Rule 5 brigade hiding in the hedgerows would shop you.
Safe flying
Cusco