Do you know why the Avengers movie did not feature Loki using a lot of magic in it, and instead, he did a lot of hand to hand combat? Or used his "glow stick of destiny" to shoot things?
Magic is boring.
P.S. I have only watched one Harry Potter movie, and there is a reason for that.
A movie with sword fighting and sorcery, will always feature more sword fighting than magic. Sorcery movies are ALWAYS accompanied with swords. How would that work with Dr. Strange?
Because magic/spells/incantations/etc., are boring.
Just for fun. See if any of these tickle your fancy.
http://www.popmatters.com/post/175033-the-10-greatest-movies-about-magic-and-magicians/