Block needs to Animation Cancel other attacks.
In a game where 1 shot can instakill you - animation cancelling is vital.
Being able to suddenly stop a combo midstream to pull up block would make classes like Drizzt viable in single-player - who requires a ton of moves per second just to stay alive.
You shouldn’t be able to attack whilst animations are still waiting to be finished. So something like destroying the opponent’s only creature with Grudge Match, then quickly attacking with all your creatures because the way is clear, only to find out that there is a Pep Talk still happening, but you’ve already locked in your attack and there is no way back. Very annoying, that shouldn’t happen.