Gamerhome vs Heroesworld

Trying to convince you is useless. Just look at the saves of how people played ;)

And should I find you some saves of how people broke the first Dragon Utopia with the Miner?

Added after 4 minutes

2 air external dwellings and 1 psychic. more than enough

I highly doubt that Konstantin would have cleared the treasure zone he actually cleared on the third week with those troops; even fifty liches (behind which lay a Pandora's box with 5th level magic, which was the only thing that saved him from defeat) would have been much harder to break through without birds.