Nargott
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Then let's just increase the stack sizes and add a hero to the stack, so as not to give an advantage.
What's so important about -1 or -2 for the neutral stack?
Imagine a strong stack attacks next, and the player is nervous: what if the negative defense bonus of -1 triggers?
This is what makes the game interesting and unpredictable.
Imagine a large map. Mixing only two Factions is very weak. It gets boring to break through the same units several times.
And above, they suggested the perfect solution in the form of choosing how many Factions we want to mix. Therefore, the argument is pointless.
You can also mix one unit from an evil Faction and one from a good Faction.
And from 2 to 4 good ones, chosen at will. Neutrals can appear in any selection randomly (instead of evil or good).
You can customize it, and that's fine. But 3+ Factions are very much a matter of taste. I saw this in TE - the first impression was that it was a bunch of misfits. Which also suffers morale penalties (I encountered this).