I see similar criticisms of Slack a lot, and I think a solid portion of these are general gripes with using one chat system instead of Email + other solutions.

I see similar criticisms of Slack a lot, and I think a solid portion of these are general gripes with using one chat system instead of Email + other solutions. My biggest gripe with using Slack is that teams are managed individually. I can't have one Slack account from which I can view all of my teams and interact with them. Rather, I have to create separate accounts for each one, as if each team is using a completely different service. Then I have to remember a multitude of emails, usernames, and passwords.