In fact, they form the basis of the so-called Bohemian school of chess composition, most fruitful in threemovers and moremovers.
gives a flight square for the black king and threatens 2.Rxf6+ Ke4 3.Nf2# with a model mate.
The main variations end with model mates from white batteries: There are several other variations (after 1...Ne4 and 1...Ke6), which do not end with model mates, and allow for multiple continuations.
In the Bohemian school they are irrelevant, as long as they end with a mate in a prescribed number of moves.
This example shows a helpmate, in which both sides cooperate to achieve a mate to the black king.