so we will see ICBM will be flying around without a navigation system.
You must be very young. There was a time when icbm were designed to reach their targets using inertial and celestial navigation system ( still are as backup mode, most the war planners assume gps will be degraded or offline in a shooting war).
US had delta wings technology but they prefer diamond shaped wings for better stealth at the moment. Delta and forward canard don't mean best in maneuverability. The Rafale & EF-2000 would still lose to F-22 in turn radius and climb.