HoMM3 HD is a mod (add-on) for the game Heroes of Might and Magic 3.

If we don't consider the Hydra situation – where autobattle is essentially unavoidable – then autobattle, in general, saves a lot of time. I understand that's your opinion because you don't play War of the Throne at all, and you don't have the data to appreciate it properly (in the late game). Regarding the skill variance, who among reasonable players would agree to the losses from autobattle, for example, in the first week? All battles would still have to be fought manually. If you agree to autobattle, the game will end very quickly.