In reply to Justin Tadlock.

since when did WordPress become "writing/publishing software"? Last I checked it was a CMS that "you can use to create a beautiful website, blog, or app". And I'll have to respectfully disagree with you on your analysis. I manage a fleet of 300+ WordPress sites, and the number of them that need ToC on a page I can count on one hand. Now, that is anecdotal "evidence" hence my question of: are there that many sites that need this block in default? Given my 10+ years of experience with WordPress, I'd say "no".