I didn't plan to write more here in this thread, but I found this interesting video that points out the importance of having set things up, and then having things pay off.
What I find interesting with this general idea of having a setup in a movie, and a payoff, is that which I think of as the importance of 'introduction' in movies in general. And I realize now that my idea of "the power of introduction" seems similar to this idea of a setup and a pay-off.
I would argue that my notion of "the importance of introduction" in movies, pertains to both 'pacing' and a 'deeper meaning' in movies, by which it would be critical of a director to have/get a good idea of exactly what is being, or what has been, introduced in a movie, regardless of it being real (a character, or maybe a place) or imaginary (like an abstract idea). For me, what is interesting with something being introduced, is not so much there being an expectation of things you might think you will be seeing, but that having a clear idea of things being introduced is important to contain a story as perceived by a viewer (as opposed to a director's ideas about there being a particular plot). I suppose I have this general idea of how various ideas in a movie are made to be interconnected by being very careful in precisely how you introduce various things in a movie.
Presumably, a proper introduction might present an actor in a meaningful way, such that you aren't suddenly seeing a famous and recognizable actor on screen playing himself, but that you buy into this world portrayed in the movie, in which any famous actor takes the second seat after the context of the situation.
Also, by being very careful in how you introduce things, I think you will achieve a contrasting effect to previously shown locations, and so a change of scenery has the powerful effect of simply making you forget the previous scene entirely, while also maintaining a momentum in the plot/story being shown.
And, so, presumably, as important it would be to start showing new things, it is also important to stop showing older things, but in a graceful way, to better avoid the viewer getting annoyed about perceived plot holes, but to keep the story going.
I am rehashing some older ideas of mine here, so I fear I am forgetting something. Hm. I guess when I was thinking about what I call "the power of introduction" in movies, I was probably mainly concerned about the notion of there being 'tension', or, 'suspense' in movies. And, that a repeated form of introduction would deflate tension, while also failing to achieve a sense of suspense, if only getting to repeat something that had already been shown earlier in the movie.