All of the conversations are still public and anyone following that specific topic (Delta CS) sees them in their “For You” feed. So it isn’t really a private group, just hidden from the all feed to reduce the noise.

We are still experimenting with this format (ultra-specific topic) as it behaves like a public group.

Thank you for explaining it.

maybe ‘all’ should be renamed to ‘discover’if it’s not going to show all. Seems to me that people will browse ‘all’ in order to discover new things in any case.

If a new subject does not appear in All, how are we supposed to know it even exists or follow it? I find it confusing that All doesn't include everything.

There seem to be valid cases where a conversation isn't meant to be followed by the public.

The "Delta CS classes" has been brought up as an example. In that case, probably ill-advised users are creating posts that really aren't conversation starters, and which should have been posted on some blog or internal forum instead. It is a good thing, in my opinion, to not display these posts to some general public.

I can see the same point be made for a post that consists solely of an external link, without even a single sentence stating why that link should be opened, or what exactly a following conversation might be about.

It might be good to add a statement somewhere that "All" means "All posts that are actually useful to potentially start a public conversation", if that's the case.