You can drive a $30K car and have a $10K backup power system.

An $80K-100K car that replaces the two isn't some genius purchase.

Sure you can spend all the money you want on a luxury toy, nothing wrong with it, but it's weird trying to justify it as anything but that.

You an drive almost every EV that has that feature too.

Or rather, you can take half of the difference in price and install some proper PV + battery system in your house that can be used when there's isn't a catastrophe too.

Yes. Many electric cars and trucks have this feature.

No, but because they can't be driven, your house stays powered when someone goes for a drive.

you're inventing the alternator from first principles

No, that's what my car is for. You can't drive your cybertruck when it's running your refrigerator. Wrong tool for the job.