1. Radar has to scan more frequently to track a hypersonic. 2. Because they can change course at high speed, a slower intercept weapon will miss if it counts o

1. Radar has to scan more frequently to track a hypersonic. 2. Because they can change course at high speed, a slower intercept weapon will miss if it counts on predicting the flight path to intercept. At present this is how most surface to air and point defense weapons systems work. 3. Point defense systems may not be able to react fast enough to stop a hypersonic. 4. More kinetic damage. This is significant for ships.