For a director and a producer to be named on the writing credits is practically unheard of.
An angel has no memory.
In the case of The Loved One, I was hired to collaborate on an updated version of the book.
Writing on a contract for a major studio you get the very best.
After Strangelove I also started work on an adaptation of The Collector.
In that sense, film is superior, but the difficulty is your lack of control as a writer.