I understand what you're saying
But i don't think it's rubbish. I think it just describes what most writers do by instinct, and with a lot of hard work getting characters to work together, with each other and the story itself. It's a deff' the movies the theroists use as examples never heard of the theory, but traits are still there and used as described by the theory.
Like I say, I'm just a novice and still trying to get a feel for good stroytelling. I'm ruling nothing out as yet.