Picture this, you are somewhere in the middle of the book. How do you easily go to the HTML ToC? You don't. But you can easily go to the NCX ToC from anyplace in the eBook.
And by going to the NCX ToC, you don't have to go back (or figure out where you wee) if you decide not to go to any ToC entry. There's many more advantages with the NCX ToC then there is with an HTML ToC.
I strip the HTML ToC has I've not yet found one I need in place of the NCX ToC.
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