The Philosophy of Heroes of Might and Magic.

Yes, I agree with you. But we can't simultaneously consider society at both the micro and macro levels. That is, we can't simultaneously look at each individual and at society as a whole.

Why not?
Let's say, we've already considered Catherine – in certain moments.
We can consider, for example, her influence on the social development of the human race, which wouldn't have been possible. Right, XEL?
And through this, we can come to an understanding of the interconnectedness of historical processes in the world of Heroes. No matter how much some historians claim that nothing depends on individuals, that's not true – if Catherine hadn't existed, what would have happened to Erathia and Enroth? If Sandro hadn't existed, what would have happened to the world, and what path would it have taken?
Moreover, the entire game, as a whole, is based on heroes (Lords) – they are the main driving force of society. What would the Heroes be like without them, as we know them? That's why I asked for examples.

Based on this, we can consider questions of anthropology.
So, the world of Heroes was created by the Ancients, and the heroes and creatures were also created by the Ancients. At the same time, there was no evolution (remembering Charles Darwin!), the heroes and creatures appeared immediately and did not change throughout their existence. The exception is the game mechanics – upgrading creatures and increasing the level of heroes. But their physiology, biology, and chemistry did not change at all.
I wrote this and thought that the question is actually debatable – there's Might and Magic 1, Might and Magic 2, and there the creatures are somewhat different, and the appearance of the Conflux means a lot in the anthropology of heroes (Lords), and then there are Might and Magic 4 and Might and Magic 5, in which, for example, peasants can be upgraded.

In general, all this could and probably did affect the psychology of the representatives of the races. After all, each race is characterized by its own type of thinking and, most importantly – IMPORTANT!!! – worldview!!!

P.S.: And why consider the game mechanics separately from the plot? Why not combine them organically?