@arnis (and others)..
My wife works from home and has a Leaf as her daily driver. Her car doesn’t leave the garage but once a day for ~30 minutes and doesn’t get driven even 50 miles a week. Her car already has chademo as standard, and her cars battery capacity is essentially the same as $24,000 worth of powerwalls.
Additionally, our 10.2kW solar system produces 100% of our power needs for the house, and on average an extra 5-10kW per day for our cars/commuting. Our neighborhood rarely loses power, not even once a year.
We do live in a hurricane-prone area though, and the options for backup power in case a big one hits and we do lose power for several days are limited to a $4000+ gas/propane home generator, Powerwall for $8K+, or a 2 way chademo evse. If of the 4 opptions (including doing nothing) I would *much* rather spend $5K on a two-way charging system using chademo that could use my wife’s car as a battery backup for our house instead of spending $XK on any other solution.
It certainly isn’t a fool-proof system and yes, I imagine it will shorten the life cycle of batteries a bit if used and depleted everyday. But realistically speaking, there are plenty of real-world applications where this kind of device/connectivity could be extremely useful for people all around the country.