True vs. Useful: The literary and psychological theory presented here has proved true, but is it useful?

A theory is proved when it predicts the unexpected and its predictions turn out to be true.

My theory, from a literary perspective, is called Multiple Identity Literary Theory. From a psychological perspective, it is called Multiple Personality Trait.

It predicts that works by great fiction writers would be found to contain unlabeled symptoms of multiple personality. And that is what I’ve found in works of literally hundreds of writers.

But just because a theory is true does not mean it is useful. I do not know that readers of fiction would get more enjoyment if they knew about it; nor that literary professors would care to include it in what they teach; nor that psychologists would wish to study it; nor that writing programs would consider it; nor that fiction writers would even want to think about it.

I hope that visitors to this site will help address these issues.