What would you change in Heroes of Might and Magic IV?

Nature also opposes death, judging by the Necromancy Ward, and Barbarians are neutral, which is clearly visible in the tavern. Apparently, the opposition is structured differently: Life, Order, and Nature against Chaos and Death. Since Demons can be attributed to both Chaos and Death, it would be logical to place them in one of these Castles.

I wouldn't judge the opposition based on wards and other magic: after all, Life has wards against all other schools of magic, and this doesn't make Life a militia. Barbarians are neutral, yes, and it's also clear which Castles are opposing each other when they are combined into one army; the game's creator has built in the logic. But this is a "mechanical" division. And I wrote that if Life vs. Death and Chaos vs. Order are logically perceived confrontations, then two Castles remain: Nature vs. Barbarian.

Why don't I quite accept the "mechanical" division? Because Death has two Castles that are opposite to Life and Nature – that's understandable; Life has Death and Chaos – more or less understandable; Chaos has Order and Life – similarly; Nature has Death and Order – it's already not very clear, just like Order has Chaos and Nature... mechanically, Nature and Order are opposing, they reduce each other's morale to the maximum, but "logically" I find it difficult to imagine, it's not so obvious, if not downright silly...

In short, if you swap Nature and Barbarian, everything would fall into place. Barbarian gets along well with Life and Chaos, and opposes Order and Death well. And Nature, by its very nature, is an excellent neutral Castle that can do without neighbors and oppositions. Let Nature keep only the Druid, it can do without the Archer. Which hero should be given to the Barbarian to pair with in the tavern?