AnotherGame is a mod for ToE 3.1.

As far as I understand, there is no mutual exclusion. You build a warehouse in a non-capital city, gaining access to mine upgrades, and that's it.

There is. Both won't be present in any city ;) You still need to reach the second city, and that takes a considerable amount of time. Why are you ignoring the gameplay on the map again? Moreover, there will be an incentive to capture the second city ;)

Added 2 minutes ago

Just say it directly - it's a tribute to Heroes 6. Even in HoMM 3.5 WoG, city conversions didn't include housing conversions, if I remember correctly.

What tribute? And besides, the first version of the mod was released 2 years ago, I've already said that (of course, there was nothing about two-player mode, but there still isn't). You need to at least play the sixth game. I don't play it at all ;) The fact that you're comparing it doesn't mean that I'm following some tradition... It would be more appropriate to say "like in the sixth game" ;)

Added 8 minutes ago

If you wanted to strengthen the tent in this way, then it will work for breaking through, at the cost of longer battles.

Is a long battle a bad thing? I apologize, but I want to be sarcastic, but that would be off-topic, as it relates to another mod :)