I now realize that Kindle Previewer is actually implementing the equivalent of the Calibre MOBI Output setting "MOBI file type: Both."
That is, it's generating both the old and the new MOBI standards. And if you try to display it on iOS, it asks you to convert it to AZW anyway.
Unlike Calibre, Kindle Previewer does NOT warn you that various Kindle devices may have trouble displaying both. It just goes and does it that way.
But since Amazon is a huge corporation, they don't need no stinkin' warnings.
And since I'm editing eBooks for Amazon, that's good enough for me.
We can mark this issue Solved!
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