Strategic spells in my opinion don't feel well included into the game. Opening the spell book through a button from beneath the mini map, then selecting your spell and target on the world map just kills immersion to some degree.
It is like doing something from outside the game, instead of acting as the souvereign and being part of the world. While I have no idea how this could be solved in an elegant way, I wonder if others feel the same and may come up with some suggestions?