Mayor of Long Beach thinks otherwise.
I was careful to distinguish “the majority” in my assessment. I view the filled warehouses downstream of the ports and the occupied trailer chassis they are occupying as the majority of the problem. These warehouses cause back pressure to the ports. The only reason raising the LB container stack depth from 2 to 4 only matters because those lots are buffers between the ports and distributors/retailers, but those buffers are full.
There are a handful of other problems, both downstream of distributors and upstream of the LA/LB ports which cause this change to be effectively a small lever.