One thing I notice is that the "Busy" or "Do not Disturb" status does not apply to notifications of the mobile discord app. You will keep getting notifications and especially in times where I'm truly busy, it can be annoying to get notifications and you are constantly forced to look. (because it could be a different app/message that's actually important).
The "Do not Disturb" status should also suppress mobile notifications.
Kind regards ~ Peri