That also meant on many days I'd have no notifications at all. A week could go by with 0 notifications. Since the quality of notifications used to be so high, I used to treat FB notifications the same as I treat my email inbox (no email goes unseen).
Over time, they started jamming in "fake" notifications like "Your friend posted a new video!" whereas in the past, I'd simply have 0 notifications for the day. After that, it became impractical to keep up with the never ending notifications.
They need to be looking at the quality of their notifications rather than their frequency.