Veg. management is a big contributor. Invasive and ornamentals are typically big causes of fire spread. No predators and uncontrolled growth, and the plant is from some area that never burns instead of the grassland plant that’s fire resistant.
Roof shingle regs can also slow spread from embers. Also, increasing density would probably help with this a lot. Concentrate the people at the city center and then there’s less people in the outskirts that are at risk