The forest management servicepeople are starting to wake up to this, although there is a lot of inertia in bureaucracy so reform is slow. But controlled underbrush burns are becoming more common.
Source: father owns a house in Yosemite National Park. We have to take care of our property by mowing/removing virtually all vegetation within 50ft of the house, but there are also controlled burns semi-regularly in our community performed by USFS.
It's also a lack of money. People are notorious for always questioning why the forest service gets money.
For example, if you do a controlled burn you can pick the day with the best weather conditions and have trained responders ready to deal with any problems. If a random power line overheats, you only know about it when half the state is on fire.
And as other point out, its inevitable a fire will start. Solutions are not delaying, since that makes them worse. Its controlled burns.
[1] https://www.nytimes.com/interactive/2019/03/18/business/pge-...