I don't think Iran has homing ballistic missiles. Only maybe China has those. As such, the best defense vs ballistic threats is simply moving around, if they can't home then who cares?

I mean, buildings and hardened targets do care. But ships can just move and the missile will miss.

But yes, defenses vs Drones and Cruise missiles is more than sufficient vs Iran. And navigating narrow waters with higher degrees of mobility is better than our other ships.