I'm probably in the extreme minority here, but I actually think iOS lately feels too complex. There are still features it's missing that I'd like, but I often long for the simpler days of earlier iOS versions. Too many different overlapping interfaces (e.g. lock screen vs. Notification Center), types of notifications, interaction models (tap vs. 3D Touch vs. hold), and overloaded basic apps (e.g., apps inside of Messages.app)—they all make me feel like iOS is just getting too complex, at least on my iPhone.