Dude, I completely agree with you!
Maybe I'll be persecuted by all the forum members for my answer now, but I'll say my piece! Heroes OF Might And Magic IV is the BEST!
Most people started with the third part, and that's why the innovations in the fourth part didn't appeal to them! Well, I'm not against other people's opinions!
But there's no need to express negativity directly, pointing out the differences between the third and fourth games!!! This is a Revolution (with a capital "R" :cool: ).
And for some reason, the differences are judged as drawbacks!

What amuses me the most is when people compare two different games in terms of playability, even though they're supposedly from the same series :)
My opinion is that both the third and fourth games are good versions; what seems like a drawback in one is a plus in the other, and vice versa. For example, in the third game, you need to create chains of heroes to quickly move the army around if you don't have the corresponding spells, because units don't lose their turn. Many people enjoy planning mobile transfers and managing to move two or even more heroes with ONE army in one turn :)
But in the fourth game, units also run out of turns, just like heroes. Therefore, there are different nuances there – now you need to create chains of units to carry the hero's tomb, which doesn't run out of turns. And accordingly, in the third game, the main striking force is still the army, which you can't do without, while in the fourth game, the main striking force is the heroes themselves. And so on, if you start comparing in detail.
Personally, I enjoy playing both of these versions. But the fifth version, in my opinion, is inferior in playability even to the second, but in terms of graphics, it surpasses all versions combined :)