Even though evacuating early is recommendedm, some people really want to shelter in place - they want to stay and defend their homes against spot fires that can go on long after a main fire front has passed.
This is not something to decide lightly. Are you sure that’s worth risking your life for? And putting firefighters who might need to save you in danger also?
Sheltering in place was at one time promoted in Australia, where many people live quite remotely, but the deaths from people who stayed during their terrible “Black Saturday” event of 2009 made people even there rethink the strategy. 180 people lost their lives, including some who thought they were safe in prepared shelters.