There's no need to insult Necropolis here. They have mediocre abilities, that's for sure. People are always yelling, "Necromancers are overpowered." It's getting old. Let's just play the game peacefully. The developers are at least not as clueless as you are, so they wouldn't create an imbalance. And there's no need to weaken Necropolis; instead, let's strengthen the "weaker" factions, like the demons.
Secondly, if a significant number of people are talking about an imbalance, then to some extent, it really exists. I have already provided my arguments in the excerpt you mentioned. Moreover, the developers themselves, whom you referred to, acknowledged the excessive power of the undead, which is why they are making changes in the upcoming update to weaken Necropolis.