Nobody agrees?

Can't honestly say "tutorials" are something I care strongly about, generally speaking.
That aside, they are usually among the final additions across the entire development process of a game, so it's not a particularly wild guess that their current form may not be the final one.
And more specifically, no, I don't think I would enjoy to get a pop-up window/mini-videoclip for every single new spell added to my arsenal.
Once we get a grasp of the general rules, the tooltip describing the spell should ideally be more than enough.