Seems like the "watch" feature is what makes this idea interesting. You receive batched updates for a channel when you're not paying attention to it, and if bot

Seems like the "watch" feature is what makes this idea interesting. You receive batched updates for a channel when you're not paying attention to it, and if both participants in the channel are paying attention, then you receive real-time messages. You're limited in the number of channels you can pay attention to. I don't really see what's stopping Messenger, Slack, et al. for adding a "work" or "focus" mode that achieves this trivially though.