Thanks for the link.
As I understand, all notifications will be fired using one discourse user. For me that’s a bit rigid. Ideally I need different users for different channels. Our discourse will serve company wide purposes, andalso support projects, which are kind of private.
But, as a workaround / simple solution I can live with a setup, where there are implicit rules like: mute all categories, which are not public. That way if I create a new category for a new project, posts from that new category won’t appear in the company wide channel.