So why can't we cast spells to damage turrets?
Not every damage spell, but how come auto attacks are the only way to push a tower?
Edit: A bit of context. A friend (He mains AP mages a lot) was pointing out that AD champions are more needed than AP because they can push turrets. For the most part, I agree with him. The marskman update is giving a lot of AD items (And it should because it is a marksman update) but after that I don't see where mages find much use.
What if AP spells dealt maybe 50% reduced damage to turrets?

bodyslamming one for instance )