Did you not just state that much time and effort was expended in developing custom fighting styles for the Jedi based on their personality? Why bother to go to that amount of effort if there is no developed personality for those characters in the film?
George Lucas, October 1979: There are essentially nine films in a series of three trilogies. I have story treatments on all nine. George Lucas, February 1999: I never had a story for the sequels.
The reason they come up with such an elaborate lightsaber methodology is so that it remains consistant in it's depiction wether it's a main or background character.
While we don't see enough of any given background character to get too far into his "personality" of lightsaber combat, it's still there.
Yeah, while they came up with it for the film, it's also made available to the EU authors who wrote the ancilary prequel fare.
I think the visual dictionaries have a writeup on it, and a lot what they have here on Wikipedia is derived from the Visual Dictionary material, as well as things written in the novelizations and EU prequel books.