I agree completely, but wanted to emphasize something regarding: "and you miss out on so much of the discussion that happens outside of the meeting." IMHO, ALL

I agree completely, but wanted to emphasize something regarding: "and you miss out on so much of the discussion that happens outside of the meeting." IMHO, ALL of the chat services make this problem worse, not better. None of them let you easily and fluidly say "I'm interested in this topic for the next few days" or whatever. They hide, rather than render discoverable, important discussions, either (due to GUI structure pushing people to do it) threads moved to 1:1 chats or just lost in the sheer volume of text scroll. The future of UI is bounded attention: "alert me for xxx _for the next { hour, next few days, this week, through next week, this month, for quarter, as long as ..., forever }" attention filtering. UI right now assumes that the doesn't change and that users actively correct it. But we aren't even at the point where that basic level of automation even exists.