A worthy endeavour that seeks to solve a real problem - how to best serve subs that want to apply moderation rules that make them ineligible for "all" status, but still want users to be able to find them. However, I'm not sure this is implemented in the best way.

In the sub discovery section /subs (default "popular" tab) actually lists all (ie english language interpretation of word "all") subs by popularity, including those that have contents displayed in /s/all and those that are listed on /subs/notall/. Go far enough down the list on /subs and you will find the same subs listed in /subs/notall/

There is no /subs/all, and no /s/notall

A more symmetric solution might be better. Give the end user the ability to show thread feeds (like as appear in s/all, s/new etc) including or excluding those eligible for saidit "all" status, and those not. Default to "all" (saidit all), allow user to toggle on "notall" to view both "all" and "notall" mixed into same feed (combining to make english_language_all!). Being able to toggle off "all" too would be useful, since if you're in the mood for debate you'll exclude notall, then might want to catch up on passive stuff in the knowledge you've exhaused all...

And there's also the issue of some subs probably not wanting to be discoverable by notall anyway. so then you'll have /all, /notall, /neitherallnornotall. at some point the language used here should be revised, before we all go insane!