Sometimes an enemy's hitbox is fairly small and I accidentally click on the ground near them, causing my character to waste points and set myself up to be hit- this is very inconvenient.
As with any suggestion like this, a toggle-able option in the options menu under gameplay is always the preferred way (in case some people still want to move with a single-click.
It's just that it can mess things up by causing actions that I, as the player, did not intentionally choose to do.