Thanks. Your input was very helpful and it pretty much confirmed what I thought might be the case.
That said, I wonder if it's currently safe to allow the Kindle to sync with "this" version of Calibre since it doesn't support Kindle collections. If it allows me to continue to send to main memory without changing any of my folders/collections within Kindle, we are golden. (At least up until the version when Calibre will do so.)
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