I wrote about Slack's addition of threaded messages — and what they mean for its growing ambitions.
Threads are for work that can't be ignored, and they are likely to demand your attention. The more they do, the less it will matter whether Slack killed email or not, because any time you saved in your inbox will now be spent doing work in Slack. From Slack's perspective, this is great news — when you're the place where all work gets done, customers will have a lot harder time canceling their subscriptions. And perhaps the chat-and-threads model will be faster and more efficient than your old system. But anytime I see a new inbox created in my life, I worry.