There is absolutely *NO* reason for you to ever left-click on one of the animated NPCs when using the methods I listed above. Hence (since left-clicking is used for movement) it is impossible for you to accidentally move your character when you meant to issue an attack order.
Apparently, you haven't noticed that you can target different parts of an enemy. Very often, you do not want to target the dead centre of an enemy, sometimes, you want to target "higher" or "lower" parts of them to place your shot.
This is mostly an issue for rangers and wizards, not as much melee (because it doesn't matter to them how the attack is placed; or at least I can't think of a single case). But there's absolutely a difference, with a lot of enemies.
First, I didn't say there
"There is absolutely *NO* reason for you to ever left-click on one of the animated NPCs". Instead, I said
"There is absolutely *NO* reason for you to ever left-click on one of the animated NPCs when using the methods I listed above.", which is a big difference in meaning.
To answer your question, I absolutely have noticed that you can target different parts of an enemy, although you're making it sound like you can take headshots or damage a specific limb, which is not a feature of this game.
You can (for example) aim to the extreme left, right, or above to sneak a ranged shot past "something" that might otherwise be blocking your line of sight (like another opponent, or a prop). Having said that, my personal opinion is that trying to shoot the hand of an opponent *because that's all your character can see from their current position* should be a little trickier than a normal body shot. Since that difficulty is not represented in the chance-to-hit percentage, I don't think it's outrageous to look at the animated movement as a reasonable hurdle to get past.
HOWEVER - none of that matters - neither my opinion stated above, nor your concern about hitting specific locations. Because you can hold down the SHIFT key when left-clicking (which is the default key for placing actions in a queue). Your action will not be initiated until you take your finger off the shift key, and while you have it pressed down you can (at your leisure) verify that you have issued an attack order rather than a movement command. If you see you issued a movement command by mistake, you can right-click (while the shift key is still being held down) and cancel your queued action - no AP used, no accidental movement, no hitting the wrong target.
Were you not aware of that?
By the way, we should probably mention that it's actually the animated movements of opponents that often allows us to sneak a ranged attack past one monster to hit a different monster behind them. If neither was flailing limbs in and out of view that wouldn't be possible in many cases.
