I know it sounds weird but I really hope that the necromancer isn’t limited to just, well, necromancy.
The idea of controlling a bunch of minions at the same time works well for so many different types of characters, the beast master, the inspiring leader, an elementalist who likes to summon hordes of elementals, or a pact broker with forces beyond comprehension.
Building a horde controlling class entirely around necromancy only seems a little limiting.