A smaller thing that is based on the same problem is that you can't use your "instants" while a fight animation is active, which means you have to use your "instants" like +critchance or +dodge at 2/3 completion of your old GCD to not lose damage.

If you use your instants at the moment your GCD is ready to use you lose the "casttime" of the "instant" and cannot hit while the "instant's" animation is active (roughly 0.5sec).

To solve both problems they should just get rid of fighting animations being at highest priority and let animations "overlap".