It's a secret. Do you have your decoder ring? see here:
To find you way around the communities, I use Turingtest2's "Site map of Communities and Categories"
Site map of Communities and Categories
Try some of these tweaks.
Minimal CSS tweaks for ASC
or
Adjust the format and layout of ASC Web Pages I use Waterfox a Firefox clone.
Either of these get rid of the banner and the need to ask to display everything.
How to improve your experience with Apple Support Communities ( ASC )
R
ps. tt2; I doubt many users will understand the container stuff or be able to figure out what is or isn't a container. I refer them to your excellent article.
R