My wife and I recently had a zoom meeting with a solar consultant to review their estimate on solar panels. Initially, I had inquired about a battery bank similar to Tesla's power wall. The consultant told us of a bi-directional charger that is coming to the US in a year or so. Its basically a charger that can reverse the flow of electricity from your car to power your house. Essentially turning every ev car into a power wall and acting similar to the F150. Apparently this charger is being used in other countries.I'm not saying that it isn't capable or can't be handy. I'm saying that the real world application isn't that straightforward.
When the power goes out, you often don't know how long it'll be out for. A few years back most of my home county suffered a power failure due to a blizzard. They didn't know how many days it would take to get power back. I believe the power was out for several days, in that time people needed to be able to go to the grocery store, check on loved ones, etc, after the snowplows went through. They needed their vehicles to travel several miles in order to do that. They also needed to be able to keep their houses warm enough the pipes wouldn't burst, keep their refrigerators running, medical devices needed to keep operating, etc.
Within the last few years my town lost power after a storm. We didn't know how long we'd be without power. We didn't know if we'd need to get out of town to grab some supplies. My wife took the car and went to work the next day.
When the power goes out, the common themes are that you probably don't know how long that problem will last, you need to keep some power going at your house, but you will also probably need to travel. Relying solely on something like the Lightning's feature to power your home is an interesting situation. One would need to assess how much range they might have (further complicated when you consider that the vehicle might not be completely charged anyway), what they might need to travel for, and how critical it is to keep power at the house.
It's a good option to have, but I think that backup power from a system of batteries, solar panels, and maybe a wind turbine makes a lot of sense.
In the event of a power outage, the solar panels could charge the car and power the house during the day. At night the car could power the house. Since battery banks or power walls are not cheap. It makes a lot more sense to buy an ev and essentially have a battery bank with wheels. This meeting took place just a few days ago so I haven't had a chance to do any of my own research.