It would solve some non-technical issues for Outlaw.
Since Coup de Grace is tied to Dispatch AND animation locked, it messes up your Summarily Dispatch stacking. The stack window is so small and the animation being almost three seconds usually prevents you from reaching five stacks when it procs early.
It also massively buffs Killing Spree with five stacks of Fatal Flourish, so it almost guarantees you losing your Summarily Dispatched stacks and start over.