For me, it's not a matter of what you, or I (or anyone) think should warrant an ID change. It's the simple fact that I don't want code making that decision.
I'm fine with a button, or plugin that allows the user to consciously say, "New id please." (or new id scheme/refine for that matter). I'm just not fine with it automatically happening by default with every conversion from epub2 to epub3. The decision to generate a new, unique book id should not be tied to other processes, in my opinion.
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