Great post. Recently noticed DND is not enough. As you mentioned, you actually have to quit the app in OSX so it's not in your app list when tab switching (with a red notification).
Thanks, and yes! Super infuriating. IIRC it’s possible to disable the red badge per-app in Notification Preferences but then becomes difficult to understand which apps have new info so I waste a bunch of time checking all of them.
https://jborichevskiy.com/posts/concentration-compromise/