> the ability to search through past conversations, start multi-person conversations, and discuss things on a channel (with searchable history and sub-threads).

> the ability to search through past conversations, start multi-person conversations, and discuss things on a channel (with searchable history and sub-threads). With a good email client you can do those things. E.g. you can make rules to move emails into folders, etc. Sure Slack is probably quicker at doing those things, but I prefer not having to rely on a 3rd party to run my business.