So how do you get calendar reminder about important event? Same goes, how do you figure out you have new email or IM message?

Does this mean you have to open calendar, email and IM app all the time to find out there is nothing new? Seems like waste of time/energy to not use notification just to show some statement.

I have 24/7 DND mode with notifications only on my watch with email, calendar and IM (and on IM i mute people who bother me too much). Well also SMS, but I'm receiving only verification codes there rarely.