Work has mandated Slack as the IM tool for the tech side of the business...
I work for a large multinational business. They've mandated that Slack will now be used for IM within the tech portion of the business, and eventually spread across other areas of the business.
Various developers within the business have discovered the "bots" functionality, and now, in our team's chatroom, actual human conversation gets flooded out by various automated monitoring systems.
As with all things, slack is good for some stuff, but not for others. The idea that everything should be spewed forth to everyone instantaneously, and that one should have to mentally scroll back through a chat log and play it back in one's head to see what's been dealt with is not one of them.