Wow - so if the grid goes down the Truck will power your house? That is awesome! ref: https://www.ford.com/trucks/f150/f150-lightning/2022/ (see bottom)
I'm not sure it makes sense though. Now you have to choose between transportation and powering your home. As well, the power needs to go out when the truck happens to have a full charge. I think it cost them little to add (because they already have on-board power ports, which does make sense), but from a practical standpoint, I don't know how useful it is.
And for most scenarios it works - having some energy is always better than none. eg. The fridge will stay cold enough while you go shop for more food or whatever.