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No, it just started that way with the first game. The developers focused on four races. One is oriented towards defense, another towards attack, the third towards knowledge, and the fourth towards magic. The first was based on humans – a knightly medieval setting. The second was composed of creatures associated with barbarism. The third was based on the good side of fantasy creatures. The fourth was based on the evil side.
That's how it started. Later, in the fourth game, they decided to correct this, but they miscalculated by focusing on 5 schools of Magic + Strength. They failed to combine 9 castles into 6.
By the way, I saw information about what the fifth game for 3DO was supposed to be. First, the developers were going to develop the ideas of the fourth game. A fifth level of dwellings would be added to the castles. And they were also going to make the game on an improved engine from the fourth game. The latter is terrible because part of the Heroes series that was released on PS2 used a three-dimensional engine with models from the fourth game. By the way, it had a square grid.
And in general, what do you think about the prospect of the Swamp in the sixth game (I'm talking about the link -
http://www.psatkha.narod.ru/ncf_other/test_30.rar)?