Which Might and Magic universe are you referring to?

Inferno, in the third game, is connected to the underworld only by its name. It is a faction of alien invaders (the Krigane), and most of the units are the result of experiments.
Rampart is not an alliance of forest creatures. It is the AvLi and Vori elves, fighting through the animals they have tamed; there are also a couple of allied peoples, but that's it. And there are only two elven units there: elves and pegasus riders.
In the factions, you didn't even mention the degree of chaos (moreover, you criticized Inferno for "low chaos!"), but only expressed a few phrases in the spirit of: "I don't like it!".

Rampart is an alliance. In Heroes 5 and 6, nations fight, not alliances, which is good. Barbarian – there are many of them, and they are different. But in Heroes 5 and 6, there are Orcs, not Barbarians (i.e., again, an alliance), which is also good. Dungeon is an ALLIANCE of underground creatures led by necromancers. In Heroes 5 and 6, these are Dark Elves, and under them are the underground creatures, which is again good. Conflux is an alliance of Fairies, Phoenixes, and Elementals (by the way, does anyone know how THIS came about in the world's history?). In Heroes 5 and 6, there is nothing like this at all, because there is a better distribution by magic, and the elementals are scattered among the factions, which is almost good.
For me, these ALLIANCES, of which there were many in Heroes 3, are what constitute chaos. In the 6th part, however, there are no alliances, which is very good.
To be honest, you resemble crowds of protesters, and Ubisoft is like Putin. Why I think so, try to guess for yourself.