I've noticed that I cannot interrupt casts like I used to be able to.
Since magic is now so vicious I think it would even the playing field if, once again, we could interrupt spell casting with physical attacks. It seems you still can interrupt another person's spell if you attack them with magic - But what good is that if they cast first?
Anyways, what I'm proposing is that we enable spell interruption with physical attacks as it was previous to the new magic system.