This new feature is brilliant:
https://meta.discourse.org/t/disco-toc-for-replies/217885/21
However, I'm finding that I have to educate my users to manually add it to replies - this markedly reduces the real world utility of this great feature. It would be very helpful to have it be automatically activated (or at least the option to have it so) in the categories / tags specified.
Of note, it only activates when there are 3 headers in a post, so the risk of it making things messy is actually really low.
Discuss this on our forum.