The fire risk maps for California I posted are not updated even yearly as far as I can tell. They don't seem to have changed since 2007. I'm sure they have other maps that are updated constantly. Think of it as the difference between climate and weather.
Because they're using outdated information? They may look at years worth of data, and try to get an average, but that information can change from week to week. The data cited here, is not the best data available.
If they are basing it on vegetation type/fire regime, then it makes sense that there would be enough to base insurance rates on. A house is a long term investment, and a house in or near chaparral with a 25 year burn cycle will be at more risk than a house in or near a Spruce/Fir forest that is on a 500 year fire cycle. Granted, there may be an occasional year where the Spruce/fir area is at greater risk than the chaparral, but that would be very rare.
I suppose the hard part comes when you get the occasional fire that burns clear through fully developed areas - like the one that burned 3000 homes in Oakland, or last year's disaster in Colorado Springs (not to be confused with this year's disaster, which seems to have burned mostly through semi-developed semi-rural 1-5 acre ranchettes). I have not seen the numbers to compare how those rare but big disasters compare to the "routine" destruction of a few houses here or there in the Wildland Urban Interface areas surrounded by or on the edge of wildlands.