American novels frequently don't follow these tropes. It's more of a Hollywood thing, part of telling a satisfying story in 100-160 minutes.

I'm talking about something much broader than the saccharine happy ending motif of Disney movies.

I'm paraphrasing The Hero with a Thousand Faces which is a study of world mythology, not 20th century American storytelling. This hero story is found around the world but PARTICULARLY in descendants of the proto-indo-european culture, particularly ancient Greece and the western Roman empire.

It's not "happy endings" I'm talking about but the hero being taken out of their world, finding themselves and growing, and returning... a hero, the story of individual progress and success.