Is 'impermanence' skillful means?

Is 'impermanence' skillful means? Wikipedia's [definition of "Skillful means"](https://en.wikipedia.org/wiki/Upaya) says: > The implication [of skillful means] is that even if a technique, view, etc., is not ultimately "true" in the highest sense, it may still be an expedient practice to perform or view to hold; i.e., it may bring the practitioner closer to the true realization in a similar way. And of [Impermanance](https://en.wikipedia.org/wiki/Impermanence) : > The doctrine asserts that all of conditioned existence, without > exception, is "transient, evanescent, inconstant". All temporal > things, whether material or mental, are compounded objects in a > continuous change of condition, subject to decline and destruction. I think that, for some Mahayana schools, everything is skillful means. So is the doctrine of impermanence "skillful means" too? I am looking for an answer which: - Says yes or no (and explains why) - References a sastra or sutra (if there is one) which claims or implies this answer - Preferably, also, explains what (if any) bearing that may have to understanding any other doctrine: such as anatta; voidness; or the buddha-nature.