source: NFPA.org video
The primary cause of structure ignition is not a hot flame wall, but a bunch of tiny flying embers: What causes a home to burn?
Building a structure that needs to resist a hot flame wall devouring the neighborhood is daunting. Finding a way to stop fractions-of-an-inch-long embers from igniting the same structure is much less so. It is possible to harden your home to resist the majority of wildfires, if your neighbors work together with you in creating conditions that will inhibit embers from igniting your neighborhood.
The two components of this work, which work together, are hardening your home and firescaping your yard. Why both, rather than one or the other? Fire is like water: like water looking the the least protected way to penetrate a volume, fire will find the least line of resistance to ignite a structure. If you leave a weakness, millions of tiny embers dispersed around your house and randomly flying around will find it and destroy it.
Therefore, we all need to close ALL the easy venues that embers have to find their way to igniting our homes. This, however, is a lot less difficult than having to fight a hot wall of flames reaching your home.