The other part that was missing was a water deluge system (it has some - see below). With the water deluge, it would help muffle the sound (currently 6 miles away gets windows blown out) and make it harder for any material that is kicked up to go anywhere (up or out) as it would also have to go through several hundred thousand gallons of water too.

https://youtu.be/LNkmwrTjKuo (NASA) https://youtu.be/dU9TTRfM_9Q (Interesting Engineering) - at Kennedy Space center.

The system at Boca Chica is shown at https://youtu.be/OsbnYp0FYKU which looks like a garden sprinkler compared to what is at Kennedy.