Mod is not a significant component for most video games, and some developers may even hate modification on their games. But for player community of M&B, obviously this is not the case.There is no such thing as mod stability in video game development. There is not a single lead designer who asked himself "will this update break a mod?".
And I'm not talking about "will this update break a mod?", but "how often an update will break a mod". I don't think frequency of this kind of events is low, otherwise it's hard to explain why more and more modders stopped updating.