Most/many structure fires that are caused by wildland fires start due to "ember cast" - hot embers carried by the wind (for distances, almost unbelievably, of up to a mile). While taking care of building-adjacent vegetation is an excellent step to reduce fire risk, it won't stop fires that start on the roof, or around the soffits, due to embercasting. That requires different approaches (roofing materials, careful roof/wall interface design and more).
ps. Firefighter II (volunteer), Santa Fe County, NM