[greggman]

Because in slack I have to check 100 inboxes full of messages not important to me rather than a single inbox with a far higher signal to noise ratio

It doesn't matter if I turn off notifications I'm still expected to know generally what's happened in my company's 100 channels.

With slack it becomes my responsibility to dig through those 100 channels. With email it's the sender's responsibility to make sure I'm on the list if they need/want my response/input and if it turns out I'm not interested I can easily mute that one thread