Actually they are mandated in certain areas here in australia
unlike the sprinkler systems you see in movies these are externally mounted , usually on the roof of the properties
the winds in these fires can spontainiously combust materials and this is to lessen the chance of that happening by reducing the amount of heat contained.
as others have pointed out they will do only so much. If the house is in the direct path of an intense wildfire, then it is unfortunately already gone in most cases with or without sprinklers
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