I didn't know about this... Moving an army without a penalty across rough terrain – that's a feature, not a bug, even though you say that THIS contradicts the internal rules of the game itself. However, the disappearance of upgraded neutral creatures after a preliminary attack on a mixed army is, in your opinion, a bug, not a feature :) Well, in reality, you need to learn some logic from AmberSoler :)
Interestingly, what, in your opinion, is the difference between a feature and a bug? The fact that this aspect is not written anywhere in the rules does not allow us to consider it a deliberate move by the game developers, so we call it a pseudo-bug or a "feature." However, I would like to draw your attention to the important point that the computer opponent uses this feature without any problems. For this reason, it is useful to know about it, and to prohibit it is, at the very least, not reasonable. Multidefeat is a pure bug, and therefore it is prohibited. What in my logic amuses you so much?
The player cannot know what the map creator had in mind. Perhaps he created intricate quests that are difficult to complete, but at the same time, he gave you wings, or assumed that they could be bought somewhere. So that the player has the opportunity for alternative solutions - either to complete the quests, or to get wings and bypass the quests. Where is the guarantee that the map author did not intend it that way? And with all these prohibitions, you may be distorting the authors' ideas yourself :)
Do you have any more questions?
