I have run too often into the following situation: My plan is that my ranger shoots an arrow to a certain foe. But it is moving back and forth and just when I click to shoot, the cursor is pointing at the floor. So, the ranger wastes her action points in having a nice walk to the foe. The floor between perhaps is burning or poisoned, or frozen. Or the foe has a big club...
The movement of the foes may be nice, but it is much more annoying than nice.