I think that both placing a hero, or even 2 and being able to set up your formation can fix many if not all issues. It would be very effective in balancing the late game and clear up some bugs without being overpowering.
As a dwarf, biggest problem late game is not only that many units do not injure, but also that when you have a large amount of say gold mechs. because of their power, they would get deployed over other troops.... I've seen dwarf defense deploy 10-12 sets of gold mechs and close to no range/DPS aside from the 3 wall units which are insanely easy to break specifically for lich...
Lastly, I wish that developers would have a forum page or even Q&A videos on youtube where they can keep us updated on what is being worked on and give players a chance to ask questions. I know this is just a mobile game, but for the amount of money, it pulls there should be some clarity. +1 for the topic because it hits the spot with AoC.