HoMM3 HD is a mod (add-on) for the game Heroes of Might and Magic 3.

Quite the opposite!
The goal was to make SoD playable on any template, including HL+U. In this campaign, both Tiamath and Wulm ended up on one-sided maps in games against me, which led to them being immediately discarded as unusable templates in subsequent games.

Andrey, I completely agree with you. One-sided maps are bad and no one wants to play with them. However, we did play with chaos rules at some point. It's understandable that you quickly get used to good things, so once one-sided maps are introduced, we'll come to the conclusion that restructuring the GM is also essential (which it is, in my opinion), and then we'll realize that necromancy is evil, and then we'll need troop experience and DD will move to water :)
Personally, I believe that restructuring the GM is the most important factor, even more important than necromancy and monoliths. However, I've come to the conclusion that for playing on HL templates, there is VT, and the rest can be played quite well on SoD.