BLITZ TOURNAMENT

You said that the first blitz quest was taken from tournament maps. So, sometimes they put an ally in the tournament. By the way, in the fourth game, I also saw a tournament map for the Dungeon of Zz'Gg, but that was a long time ago.

I didn't even think about the portal at that moment – you swore you wouldn't appear there. And here, I think, there are no such maps.

And sometimes interesting tactics emerge there because you can transport your hero to the territory of an ally, far away from your starting point (and in the third game, you can even buy him directly in the enemy's tavern).

You're confusing concepts... :)

I think there isn't a single trick that can be done with an ally that can't be done with your own hero. Take any tournament map, replace the ally's city with your own, and play. You won't lose anything.

And you can safely

...transport your hero to the territory of an "ally" (read: your own) far away from your starting point...

That's what I'm saying – all tactics arise from the incompetence of the map creator.
Maybe I'm wrong – then enlighten me, what's the trick? An ally is extremely useful on foot, maybe on horseback, because he's a great helper! :) But he's not needed when you're a grown-up. :D