Of course, we have focus preferences. But management can also make replying to any Slack DM mandatory as well. This is bad management, not Slack's fault, right?

After all, I'd like to be in one conversation, rather than be chatting to 5 different people simultaneously over a long time and get constant notifications.

With Noor, you jump in, get it done and get out (if it's for a task). But with Slack, you have to keep a chat thread open in your head for a long time, and get constant notifications, or get dragged into multiple chats at once. So which is worse?

Noor is also much better than the office, since in the office you have to respond to a shoulder tap, but in Noor it's just one click to go to focus mode, or go to a room, so people know you're talking, or just ignore nudges. You can't say those interactions in the office were all bad, because it's clear there is something special about collaborating in an office. Remove office distractions, but keep the collaboration. Sounds like Noor.