Originally Posted by Jellby
I'm sorry, but that's not a good reason (there are others, but not this one, in my opinion). That's exclusively a feature of a particular vendor, which besides corresponds to a different format. We are talking about ePub books, and Amazon does not sell ePub books.
Your reason then downgrades to something like "an HTML table of contents is converted to an inline TOC in mobi, which then shows in Amazon", but that loses much of its strength, and there are other ways to have an inline TOC in mobi.
Yes, BUT: much of this "html toc's are satan" and "only ncx's are saintly" discussion is about to go the way of the Dinosaur, anyway. The ePUB3 standards are essentially nuking the NCX, in favor of an all-in-one TOC that is, for all intents and purposes, an HTML TOC. If not precisely, it is far more akin to that than to the NCX. Therefore, arguing about which is worthy and which is bad is moot. Righty-o?