Personally, the most annoying auto/non-auto missing feature is WiFi network priority. You can have an iOS device automatically join a wifi network, but there's no way to tell it which ones should be prioritized. So when you're in range of multiple, it may join one you would rather not join, even if it has lower signal strength.

Case in point: my iPhone is set up on 4 or 5 neighborhood WiFi connections. When I'm down the street, my connection will go out of range and it will join a different one. When I get back home, that other connection will stay connected with very low signal strength and I have to manually join my own full-strength connection. That's a huge PITA.