Absolute skills

and in general, the point was that a hero with Special Ability (SA) is superior to an equivalent hero without SA.

No, initially you said that you don't like heroes who can't acquire SA without a mentor, and that such heroes should be reworked. In response, it was argued that these heroes, in general, are no less viable than others and that there are reasons why it makes sense to play them (and this meaning only increases considering that the mod has a multiplayer focus).

I don't remember offhand, but doesn't controlling machines belong to the Necromancer's SA skills?

Once again. Kaspar starts with the ability to control machines. Controlling machines is not part of the SA. The hero is good, especially for rushing, but it can be difficult to develop him for SA because he won't get the necessary skills, and that's what I'm talking about.