As well they should not. Powering your home from EV batts means you have no power in the morning to drive to work.
This is all half-arsced bad tech. Battery tech is about 3 decades from being usable. And, anything labelled “sustainable” (e.g., solar, wind, tidal, geothermal, etc) is nothing but headline grabbing virtue signaling. All it accomplishes is money laundering.
The US power grid is not antiquated. It is like your blood vessels in your own body. It has grown. Tinkering with it while you are walking about? Dumb and fatal.
If the shtf comes about, you don’t run your EV until mid-day when batteries have come back. Problem comes about when you want to drive somewhere and you ‘drive off’ with the only battery with you. What does the PV at the house have to work with !!!
Nothing comes without compromise.