Yes, I agree with the short story part, these are attractive to film makers and for instance I think all of the good Stephen King films are based on his short stories.
I always though Man who fell to earth (Bowie) was an (unofficial?) version of Stranger in a strange land, I can't think of any other Heinlein films apart from Starship Troopers (which is a pretty short story and nothing like the book).
There is a recent (2021) Japanese movie of The Door Into Summer. Other than being set in Japan, it was pretty faithful to the book, as I remember it: https://www.imdb.com/title/tt13757540/
I always though Man who fell to earth (Bowie) was an (unofficial?) version of Stranger in a strange land, I can't think of any other Heinlein films apart from Starship Troopers (which is a pretty short story and nothing like the book).