Thatvis a strawman. Open spaces don't make companies go bankrupt either. Yoi could also say Slack does not cause nuclear wars, which is also true but also not the point.

Slack was supposed to be a progress compared to other communications channels, for instance mails, phone calls and previous IRC channels.

My takeaway from Slack is that it is very nice for chatting casually and organizing lunches, but it does a poor job at improving professional communication. I sometimes feel its appeal is mostly gifs for fun and the ability for managers to ping people and expect immediate answers.