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Those who say that there are enough units either haven't played much or have a poor memory. The more units, the more choice. Even better would be to add new races instead of neutral creatures. It's a pity that the Fusion, Swamp, and Nighon factions are gone. Just replace a few units, and a super add-on is ready. So much has already been discussed; is it really that hard to refine the idea? Nival could release an add-on with three new races right away! The disks would sell like hotcakes!
And if we continue to delve into philosophy, we need to make at least two types of heroes, like in Heroes 3: one type focuses on strength, and the other on what? That's right, magic. Orcs would focus on strength and war cries. And the first type would gain more attack or defense, while the second would gain more magic power or knowledge. This would solve another serious problem: when playing on a map with 6-8 players, there simply aren't enough heroes of your race. But this way, everyone would get their share.
And from the previous (Heroes 4) game, I would like to bring back the ability to build a resource mine for money. Or even gain the ability to build such a mine.
Regarding monsters: they could bring back the azure dragons, rename them, but have a unit that costs a lot, deals a lot of damage, and strengthens the army, even if there's only one of them.
And there were cool units in Heroes 2 – ghosts – they recovered health equal to the number of enemies they killed. Make them weak and place them as neutral undead. Of course, it would be a bloodbath, but it would be interesting and fun to accumulate them. And I especially miss the nagas; they were better than rakshasas, and nothing can replace them.
After reading this, please don't judge too harshly – this isn't a message, but a cry from the heart!