Yeah, I think the key distinctions are: - the "topics" are grouped under "streams" that are defined at the organization level. Slack lets every individual set

Yeah, I think the key distinctions are: - the "topics" are grouped under "streams" that are defined at the organization level. Slack lets every individual set up star groups for channels, but in practice channels are an unorganized mess for all. And, because they have that container, topics are just zero-friction to define. - Streams, not topics, have membership and permissions. I like this because it means that streams can be defined as an _audience_ for a number of topics. Whether that topic is relevant to you at the moment is a different question, but I often want to be able to skim all of my (e.g.) `team-galactus` topics quickly before moving on to stuff about `greater-denver` or whatever. I also don't want to have to invite people to (or exhaustively document) all of the various topics that they might have a connection to.