I would think it is there for those (hundred/thousands ??) who have older devices that don't support the ncx TOC...or don't support it very well. It's about inclusion and all that.
I don't get annoyed when I see an HTML TOC there, I just flip to the next page. Having said that, if it is not styled very well, then it's a good indicator that the rest of the book isn't styled very well either.
|