Well I wrote early in the game. Early techs are not as valuable as 2 strength 5 units with which you can easily eliminate at least one neighbor. Plus, techs can be gained by huts as well, so I really can't say they are unbalancing if popped by a dungeon instead.
I don't consider the dwarven axemen REMOTELY as powerful as you paint them to be. Granted, on a reasonably small map you could get to a neighbor fast and your Axemen would be quite the asset, but unless you're playing Duel, is it really THAT unbalancing?
I got the dwarven battle result twice or thrice so far. One time I hacked two of the lizardmen to pieces, but the third one counter-attacked the next turn and one of the dwarves fell.
Second time I killed one of the lizards and fortrified the second dwarf, the Lizardmen then scurried off into the wilderness.
The dungeon had been quite far away from home, so I sent the dwarves on their long march.
One fell to a Bear a little later, and the other ran into Orthus. To my surprise, he wasn't attacked, though, but Orthus retreated into the wilderness.
(How somewhat later it turned out Orthus wasn't retreating, he was beelinging to my capital is another story)
I think the Dwarf fell later investigating a spider-infested cave near one of my bordertowns when he finally had made it home.
So, those dwarfs were not really that much of an asset to me.
Also, negative things like a spawned Hill Giant roaming just outside your borders or just something mundane like having your first scout disappear without a trace very early on can have quite some impact.
It's nice to see there are a few things that can tip the scale somewhat in your favor.
I have to say, some of the "Legendary" rewards are quite underwhelming, though (I'm looking at you, Jade Torc).
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rezaf