Sam Kottler, ingénieur système chez GitHub, dans une interview à Uses This :

I spend a lot of time on Slack for work, talking with friends, and collaborating with folks on open source projects. I’m increasingly unhappy with the demands it puts on my time, how it has adapted chat from a best-effort ephemeral medium into something more like email, and the lack of federation. Lots of people dislike email, but I never found it burdensome in the same way realtime chat has become.