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A common mistake, not just among the creators of HoMM. It is believed that "supposedly" skeletons are made of rotten bones that crumble from even a light blow. I completely disagree with this.
A true necromancer, wanting to create a truly powerful unit, will reinforce its bones with dark energy to such an extent that it will be impossible to break them at all. Have you seen Ghost Rider? In essence, it's indirectly related.
And what part is actually missing? Only the skin, muscles, and internal organs are missing. Of all this, only the muscles, ligaments, and tendons strengthen the bones themselves; all of this is more than compensated for by good dark enchantment.
As for the heroes, I'm not arguing that the amount of HP doesn't matter here. But all these units are just a quick fix, a couple of mana points spent on a crowd of weak skeletons, when it's not a problem to spend a couple of thousand and create one - but stronger than an entire army.
Added 3 minutes later
Yes, by the way, I updated the mod.
Took the "Presence" ability away from the Messengers and gave it to the dragons.
Weakened the neutral dragons.
Increased the stats of the Messengers proportionally to the stats of the Banshee.
Now, the two versions differ only in the damage from the "Scream of Terror".