Not necessarily true. I have slack threads with external partners that we use daily. It’s extremely useful when you need to get ahold of someone quick or consolidate information that would easily get missed in an email thread. And with some of my partners only being allowed to use certain IT approved applications/chat accounts (either for security concerns or admin tools), you’re basically limited to the big players.

It’s stupid how much I rely on it. But as frustrating as slack can be, I wouldn’t be able to make the numbers I’ve had from setting those channels and threads up.