Brilliant idea. Take your hero to the middle of nowhere — let the host search for it!)) You might as well bury it in the ground and draw a map — like, find the tree with the scary face, move the screen left by 12 cm, then down by 3, center it, close your eyes, wildly wave the mouse while chanting shamanic incantations, and — voilà! — your mouse is on my dead hero!:D

:) Well, let's also forbid fleeing with a hero from battle. Because fleeing is basically the same as Town Portal :) And if you don't have that magic, then don't flee from battle — replay it until you're exhausted :) As for pulling out the tombstone — we've been through that already. Why did the developers make the tombstone? Why did they allow units to pick it up, put it in their pocket, and carry it? And what if I die not under monsters? Suppose I attack some pyramid, get crushed there, and they toss the tombstone out. In that case, a unit can calmly walk up to it and pick it up (this is provided for by the game developers). So why exactly can't you pull a tombstone out from under monsters, if such a possibility exists in principle? Then first suggest that the developers redo the game :) so that there would be no tombstone at all, like in Heroes 3 for example :)
Next, your argument boils down to the fact that an offline player has no reason to lose a battle with a hero and turn him into a tombstone — like, the player can always replay the fight or not attack there at all if the battle can't be won. But the tombstone nevertheless exists in the game. Continuing to think logically along with you, we come to the conclusion that an online player simply needs the trick of pulling a tombstone from under monsters. When he attacks, he can't guarantee the outcome of the battle 100% unless he's trained harder than everyone else like Bruce Lee :) And if he accidentally loses, he has no chance to replay. Like, on that optimistic note, he might as well concede the game if he loses his main hero. Or, quickly pull the tombstone out from under the monsters with a unit and continue fighting. And that option is more normal from a gameplay perspective. So here's a question for you. Why, in the same game Heroes 4, should online and offline players be given different rights to save a fallen hero? :)
A large number of prohibitions on normal gameplay moments turns a good game into a bad one :)