When trying to take down a tower next to another tower, a lot of times a hero won’t hit the intended one or won’t hit either and will hit a spearman behind him. Same at the gate if the Gatekeeper is alive. Heroes tend to want to fight GK even if holding towards the gate.
Target Lock would allow us to select any enemy object and hero would focus on it so he would attack our intended target. This could also help improve Autoplay if you select targets and the hero Autofights it until that target is destroyed.