The fire would skip some of the houses. The reason those houses were skipped and weren't burned was because they had fire-proof roofs. All those that burned had wooden shingles.
I guess they didn't learn anything.
However, if the brush or tree goes up next to a cement tile roofing, it can and will ignite the underlying wood framing, not mention the wood framing on the inside of stucco. It's called heat radiation.
Saw a TV video last night where one side of the street was in ashes, but the firefighters were able to stop it from crossing the street. The destroyed homes were of the same newish development and all had cement shingles.
But yes, wood or composite shingles are just asking for it.