The fundamental problem that controlled burns face today is that there has been a huge and irresponsible increase in development on "Urban-wildland border". Here in the California Sierras, you have a uniform peppering of (often luxury) houses outside of the various small urban areas. Those forests naturally burn on a regular basis but with this situation, any controlled burn is going to threaten some number of houses…
Forest fires of a historically typical magnitude would pose much less Danger to communities adjacent to wildlands. This is further complicated by the fact that any of these communities and dwellings were not designed for fire resistance because public policy at the time was no fires ever.