Are there really only a dozen or so tropes or plotlines in most movies

I think that aptly summarizes the point I was trying, insuccinctly, to make. You can tell a good story without structure but you’re often getting in your own way, whereas you can structure practically anything whether it is compelling or not. Telling a good story efficiently and well, however, and in a way that flows so well you don’t even notice the structure is a true art that few writers achieve consistently.

Stranger

That’s basically Heinlein’s list (though he calls the last one “The Brave Little Tailor”).

John Hodgeman includes three additional plots: “Man versus Man,” “Man versus Plan” and of course “Man versus Canal” (but he’s kidding).