Isn't SFO's problem due to the intersecting runways? SFO has 2 parallel runways used simultaneously for landings and another two, which intersect these 2, used for takeoffs. When there's fog, only one runway each for approach and landing can be used, which cuts volume by at least 50%.

LAX has 4 parallel runways so these can remain operational is almost any circumstance. At least you know delays there should only be caused by backed-up traffic and not due to reduced volume.