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Ah... Well, we did kill 2000 skeletons and upgraded vampires... Dragons are not great for Necromancer... But you can do a lot with Galtron at the beginning, just like with Shahti... But if the monsters are strong, there's nothing to make skeletons from. With 10 Titans, you won't get many skeletons. And then you can't cast "Bless" on the skeletons...
A random hero and no more restrictions – that's what a Necromancer needs! It will still be nerfed anyway.
But the game had a restriction on amplifiers; otherwise, they probably would have gathered 3k. In general, here, luck played a bigger role because the Necromancer has weak stats; otherwise, there would have been no chance. Therefore, I think limiting the Wizard skill is perfectly reasonable and rational.