I can answer that one, when your fighting tool is cheap enough and available in enough quantity that you don't need to maneuver.
Example, you have an unmanned aerial fighting drone. You can spend $10,000 for a simple fighter drone that does nothing but carry a next-gen AMRAAM into a furball or you can spend $500,000 for an advanced fighting drone that has the capabillity of pulling 20g turns, dropping chaff & flares, and some sort of ECM suite.
Evasive maneuvers are obsolete when you're faced with this purchasing decision, because if you can send 10 or 20 sacrificial drones in to swamp their defenses, it's still cheaper then building a super drone.