Too many unnecessary notifications
So it turns out the Android mobile app has the same issue as the desktop app. Too many unnecessary notifications, like suggestions to use certain features, as opposed to notifications about actual concrete issues on the phone. And they appear at least a few times a day. On the mobile app, there is at least a clear way to turn them off: by disabling the push notification setting. The issue is that said notifications seem to be clumped under the categories "Protection notifications" and "Security alerts", which, based on the names, seem as if they may also correspond with potentially more important notifications, that would be missed when disabled. Nonetheless, I have disabled the notification categories because the unnecessary notifications are too persistent. That's how annoying they are. Please make separate notification categories to separate the unnecessary ones from the more critical ones.