I wrote my 2 cents about this article, in a follow-up Medium post - https://medium.com/@preslavrachev/slack-isn-t-the-problem-we...). Here is a just a relevant comment to this discussion:

"[none of the arguments], has to do with the tools themselves, as much as it does with our way of using them. We have come to a point in our development, in which 24/7 availability is perceived as normal and expected behavior. Yet, to blame it on the tools we use, is like blaming it on the hammer for accidentally hitting your finger while trying to hang a picture. Indeed, the tools we use, have certainly made it easier for us to reach this point, but ultimately, it is us who pulled the trigger, not the tools."