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Hmm... actually, it's in the options in Heroes 4. The only thing that's inconvenient there is the grid (in my opinion).
2 Vortex, when the battlefield is filled with many objects, it's actually more realistic and adds complexity and variations to the tactics. The only downside in this case is when the obstacles give you a clear advantage; by the way, this is more obvious in Heroes 5.
As for King's Bounty, the idea of having objects on the battlefield is certainly good, but it doesn't really suit Heroes.
2 Vortex, when the battlefield is filled with many objects, it's actually more realistic and adds complexity and variations to the tactics. The only downside in this case is when the obstacles give you a clear advantage; by the way, this is more obvious in Heroes 5.
As for King's Bounty, the idea of having objects on the battlefield is certainly good, but it doesn't really suit Heroes.

Барон "Vampires"
Отдай свои прошлые сны,
В сомненьях себя обрети,
В бешеном танце душа кружится!
Не думай, что будет потом,
Здесь и сейчас мы живем,
Стань хоть на миг сам собой, слышишь!