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Well, with Necromancers, there are generally no problems with the AI; the AI doesn't "thin out" the skeletons very well. I remember when I was just starting to play and didn't know much about the heroes, I would mostly get beaten by 200% from Conflux. In games where the AI captures a second Castle through Conflux and, thanks to the double growth rate (8 Phoenixes per week from two Castles), a good mage hero, and an abundance of resources, it grows very quickly, plus magic in the form of Earth or Water Elementals, etc. (whatever it summons). I remember the AI playing as Crag Hack, it would come with all sorts of nonsense but would absolutely dominate and not just in one game (it wouldn't capture, but it would destroy almost the entire army, and it would always break into the Castle with ballistas). And once, Inferno came with a bunch of demons (a paradox, but somehow it managed to recruit them =)). Moreover, it was clear that all the stacks were proportional to each other, and the stack of unupgraded demons was very large and clearly did not correspond to the standard growth rates. But I've never seen the AI gather more than 1000-2000 skeletons; in my opinion, the Necromancer AI is weak. These were just thoughts about the AI in the game. It's a bit off-topic, but it just brought back some memories =)
Taking this opportunity, I'll ask: in almost all games, there are bots with a higher level of artificial intelligence, but I've never encountered one in Heroes 3 (I haven't even looked for one). Maybe there's a version where the AI doesn't just go crazy, but at least doesn't act stupidly, even with equal resources.