You listed a bunch of action/adventure games (AKA, diablo clones), which simply operate under totally different types of rules than a game like this. Yeah, it'd be cool if you could get your save games updated, but that would require some pretty weird programming to extend off what they currently have.
When you create a new game, ALL of the content of the game is generated at once, including which random armies exist, what lewt in what location, how much in the little piles of gold, and which leadership flags there are. All of it.
I can completely understand that with that as a basis, it'd be pretty darn hard to just smush more stuff in there.
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