NHF – new heroes for Heroes V 3.1.

Possibly. In this regard, it's definitely better when a special ability is useful both for clearing obstacles and for fighting the enemy. But sometimes it's difficult.

I agree – it's unfair when one hero's special ability is not applicable in most cases, while another hero's ability is always applicable (by the way, I think Dyrael and Leto are also disadvantaged – their special ability is useless against the undead).