David-
- An article with many short sections would inappropriately get a TOC
that would waste space.
Then remove some sections.
- An article with just two very long sections wouldn't get a TOC but
would be appreciably helped by one.
Then add some sections.
- Sometimes a TOC would be best located not at the top of an article,
but after a short introductory paragraph. I think some dead tree encyclopedias use this method.
That's the current behavior.
- If displaying TOCs is off by default,
It is enabled by default.
Regards,
Erik