Nargott
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I'm talking more about the appearance than about the specific abilities and roles in combat. Variety increases interest—it's much more enjoyable to play with completely different units than with the same ones, just with different colors.
I meant not the total number, but the number of skills a hero has learned at the start. Maybe I misunderstood what was written in the concept. I was talking about the "if you don't want it, don't take it" approach. It's quite annoying sometimes that the hero you need initially has skills that are not useful for your tactics, but there is not enough space for what is very desirable.