This is the only thing that stops me from using legacy movement. With standard movement, I can hold right-click and move the mouse to turn in the middle of a cast to follow a moving enemy or avoid a glare. To deal with either of these things in legacy, you have to move at least a little, so your cast gets interrupted. I otherwise like legacy better, but I can move well enough in standard that it's not worth genuinely losing something (as opposed to it just being a bit harder).