Managing 8 heroes on the map.

That's right! It's strange that they haven't implemented the ability to deploy more than 8 heroes onto the map in Warlords yet (at least 10-12). They could also make each subsequent hero more expensive, so it wouldn't be completely free... For the 9th hero, for example, 3000-3500, for the 10th - 3500-4500, for the 11th - 4000-5500, for the 12th - 4500-6500 (approximately). And the dungeons should also be paid for accordingly.