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Amazon inserts the Amazon ID into the mobi-asin (exth 113) field, and that is how the file ships. That is what an exth 113 field is/does.
Nothing/nobody fills the "amazon" identifier automatically.
The Kindle doesn't care what mobi-asin you use, if any. Except for linking to the storefront to download cover thumbnails and the Book Description link. And goodreads of course.
I don't *think* hardcover ASINs should be a problem.
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As for why the different calibre identifiers: Different storefronts will repeat ASINs. An ASIN for an amazon.com book might be for a totally different book on amazon.co.uk or any other country.
So Kovid decided that amazon:**************** should be a manually added identifier for store linking, like google:********* and urls and others.
mobi-asin, which is the book's ASIN, does not provide a clickable link in the Book Details panel, so as not to confuse people.
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