Missiles since the 80s or so don't just fall down. The discontinued Pershing MARV could perform 25G maneuvers/corrections and was radar guided and had terrain mapping.
Well yeah, hence "(somewhat simplified)". One is a lifting body that control its flight path and can decide whether to strike or to just keep flying for another 1000 miles, the other can slightly adjust its falling down path and wobble enough to hopefully confuse countermeasures.
