Exactly what is the point of being able to flag paragraph styles as only applying to the template itself and not documents based on the template? Doesn't that sort of undermine the entire point of creating the template in the first place?

And why is it that if I modify a style, changing that control from Only in this document to New Documents based on this template, the change doesn't stick? I go right back into the style and the setting has reverted to Only in this document.