Evergreens burn like torches.
Californians are generally advised against having shrubs up against or very near homes. Rose bushes, flowers and the like abut our house, but there are also some fruit trees, palms and other trees dotting our postage stamp sized lot. If a wildfire with winds over 40 MPH hits our street, our house will surely burn unless the FD takes a dedicated stand to save it.
High winds and flying embers are nearly impossible to defeat with or without "defensible space." Embers get wind carried hundreds of yards, hit the wood eaves or other fuel, and that's all she wrote. The house is aflame before the FD can dispatch resources from the main fire half a mile away. That's why evacuation zones are so large and often so remote from the actual fire location.
That said, in 35 years no fires have come close enough to threatening our home that we actually had to evacuate, knock on wood.
California is home to some 40 million people. The news profiles the hundred or so California homes consumed by fires most years, but in reality they are a tiny percentage of the overall.