Moving will be made to interrupt spellcasting at a point in time...

[AmyRae]

Ahh, but this is where your mistaken. There are multiple threads of page upon page of posters specifically asking for a manner to interupt therecast do to animation lock restrictions and cast times.

In all of those threads no one really mentions a good way to do it, all they do is blatently complain about the issue and that there should be away to break a spell cast and its animation.

Now they got what they asked for and are complaining about it. Again, its be carefull what you ask for, you just might get it.

1. There is already a way to interrupt spells in the game.

2. Yoshida said there will continue to be a way to interrupt spells without moving, and this isn't the reason he's adding the move-interrupt mechanic.