I would be a little leery (am I wrong?) to submit an epub to KDP. (Wouldn't it be better to convert it to mobi first in Kindle Previewer or with KindleGen? I mean, isn't mobi friendlier to KDP than epub?) But yeah, I'm with you on including the inline TOC. Thanks, man.
Originally Posted by Notjohn
Well, I upload my epub to the KDP, and Kindle editions work best with an inline (actual) TOC. So that to me is "a clear reason to include it"!
My books also appear on B&N, Kobo, and Apple iBookstore. I've not had any negative feedback with respect to the TOC.