The learnings from here are that some people are prepared to pay for the defensive gear, and others won't even bother to rake up the dead, dry leaves from under their wooden decking. Some houses burn, some don't. Mostly it's about preparation and determination. There's also luck.

Some good, some bad...

There's a market there, alright, but like all markets, it's complex.

A couple of wrinkles:-

As you've deduced, independent gasoline-powered pumps or home generators are required to give security of power in the moment of crisis. Unfortunately, when that moment arrives, the adrenaline level is high, the temperature is extreme, the atmosphere is polluted, perhaps even toxic. Nobody is thinking straight.

Gasoline engines often fail to start-up in those extreme environmental conditions, especially when a panicking human is hammering on the "start" button, or pulling on the drawcord, and they haven't had a practice start for 6 months or a year (or the fuel reservoir is good for 20 minutes and the fire danger for 40!).

Electronic start-up systems often fail due to panic, poor preparation, lack of rehearsals, or failure to properly isolate the local system from the mains (under the pressure of events, usually).

You have to design a good system to be both "Idiot Proof" and "Panic Proof".

In Australia, roof-top sprinklers are a good option. They drench the roof and the gutters (add tennis-balls to the downpipes or have electronic valves, and capture the overflow back to the pool or into a rainwater tank).

The main danger in wildfires is ember attack - sparks and glowing leaves and bark showering down on the ground and the house, rainout from a convective firestorm. Direct attack by fire is a much lesser danger.

In truth, the best defence is a person or two with a medium pressure hose, brave enough to stand outside for all except the worst of the firefront, and wet-down the exposed woodwork and any embers that arrive in dangerous spots.

House design helps. No eaves, no underfloor, no open decking, no wood on the exterior, and keep the garden cut back 3-5 metres (yards) from the house. Use overhang of the roof to provide shade to the windows, not nearby greenery - which will become a source of flame attack.

And plant soft. green, "european" (or American) plants. Not Desert plants...