I'm not qualified to comment on whether Finder and the Kindle app are "very poorly designed", but I'll stick my neck out and say that neither are "random". I would also say that an application that is a manager of digital books would by necessity need to accommodate the Kindle app – and an application that runs on a Mac would by necessity need to accommodate Finder. Lastly I will say, with respect, that Calibre is very complex and could be much more simple and achieve many of its design goals. That comment will may mean I won't get much more help in this forum but that's my opinion.
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