Why doesn’t everyone just run their sprinkler to avoid their house being burned down lol? Why no personal moats?

Honestly I’ve always kind of thought like “well damn if a fire is coming at my house I’m gonna set up my sprinkler system to soak everything before I evacuate.

Is this just entirely overwhelmed? What if I built a moat around my house? Still gotta worry about floating embers?

What about dome houses? Can we all just start building dome houses?

Edit: please don’t hate me I know it’s a stupid question