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I only leveled up a hero with ballistics for one specific battle!
The battle against Das, a specialist in minotaurs, who resides in the Dungeon. We reach this location after defeating the brown faction and others...
He's in a castle on cursed land with several thousand minotaurs...
Therefore, without ranged attacks and ballistics for the main hero, we can't prevent him from leaving the castle, and we'll suffer losses, and they'll be quite unpleasant...
That's why I specifically leveled up the hero Uland with ballistics for ONE SINGLE battle...
So that, with a caravan, cheap, purchased archers in the Father of Dragons' Might (so they don't get hit by ranged attacks) and black dragons to block the gates and absorb ranged attacks from the towers, we could win this battle with almost no losses (for the Diamond something or other). I didn't use ballista anywhere else.
With ranged attacks and artifacts that increase ranged attack power, it would be faster and with no losses, but I played it differently.
I'm too lazy to level up a random hero just for one battle. I would simply equip him with the Cursed Armor and the Sphere of Prohibition and kite the minotaur archers, while quickly destroying the towers with cyclops.