The topsoil becomes hydrophobic for a time due to the vaporized oils in plants and a bunch of physics I am fuzzy on. This means they’re less likely to absorb any water during the next rains after a wildfire and you get what are called post-wildfire debris flows (a type of mass wasting/landslide). They’re so predictable that planning for them and predicting where they will occur is a regular part of wildfire response in certain states.
Your boots may sink into soup and add any sort of slope and that hillside is going down.
Oh wow congratulations. All the best from us left behind! I can’t imagine the undertaking to get out and give everyone who has ever emigrated props.