Project categories?

Is there any way groups with different posting policies could be distinguished from each other? Maybe cwg- for closed working groups ? Alternatively a label like closed on any non-open discussions

I understand the benefits of closed working groups for developing ideas that aren’t ready for public criticism yet, especially unthoughtful criticism from entrenched opposition—but I think it’s important to label any closed discussion as such. I don’t want to see a discussion among experts and come to a mistaken belief that it represents a consensus opinion when critics didn’t have an opportunity to reply.

Additionally, I think it’s advantageous to members of a closed group to see that their posts are still protected from inline criticism from outside the group. Otherwise I worry they too may come to a mistaken belief that they have discussed an idea sufficiently enough that it represents a consensus opinion.

If discussion of silent payments is meant to be open, why do I need to join rather than just reply like in wg-blockrelay or have it just be a tag like for wg-cluster-mempool ?