Philip Giraldi, former CIA agent the United States wrote about the limitations of the THAAD system on the X Twitter social media (previously, there are only 9 THAAD launchers in the world).
Each launcher has 8 missiles on it, which means that if Iran fires 100 missiles, 84% of them will be safe from THAAD, even assuming 100% Tad projectiles from 2 batteries have a direct hit.