> However, redesigns usually fall into the “high effort, high variance, questionable benefit” bucket that businesses try to avoid at all costs. Unless something is absolutely broken, not many companies are willing to invest.

I have no idea what kind of feedback they received, but Slack was not absolutely broken; it was not great, and the redesign made it worse, not better. If you already know that redesigns should be avoided at all costs, why did you still do it?

Also as a sidenote Slack's notification system is still hopelessly broken; I will regularly respond to a DM on my phone, get back to my laptop, click on a notification, only for it to bring me right back to the message I literally just responded to on my phone!

Discord handles this beautifully, the moment I look at a message on my phone it's marked as read on the desktop client. I can't believe a feature as core as notifications in a chat app can be this broken compared to Discord's beautiful implementation.