While sprinklers are great, there are issues.
They should have their own dedicated water supply. Drawing from the city system will deplete water available to fire services.
Having responded to a number of homes with sprinklers, they have very little intended affect on the home they are intended to serve when the wind is blowing hard as it was in LA. Your neighbor might be happy with your sprinkler watering their home, however.
I guess the effectiveness of sprinklers depends on which way the wind is blowing.
If I were doing it in CA I would load up on sprinklers on the east side of the house presuming Santa Ana winds from the east.
That is not a perfect solution by any means—a close look at wind directions around LA in the past few days and forecasts in the next few days do show winds that can come from the north or south.
In a true firestorm situation then it is like a tornado of course.
It is all about mitigation—you can try to move the odds in your favor a little bit—no guarantees.