This probably isn't meant to be installed in your home. Additionally I think Tesla's philosophy has been to popularize electric cars first and foremost, regardless of whether it's their own cars, so designing proprietary stuff won't help.
Elon Musk in general seems to go for "inspire other people to make shit, even if I personally go down in flames in the end". Of course, that doesn't mean he takes unnecessary risks, he just values doing inspiring/world-changing things more than doing profitable things in the long term.
(Also this would probably be great for self-driving electric cars)
I think tesla would be very happy for other companies to be making electric cars and using tesla for batteries and other components. Really I think this is the long game, to goad other companies into making electric cars and then to be the control the primary means of powering / recharging them.
Elon Musk in general seems to go for "inspire other people to make shit, even if I personally go down in flames in the end". Of course, that doesn't mean he takes unnecessary risks, he just values doing inspiring/world-changing things more than doing profitable things in the long term.
(Also this would probably be great for self-driving electric cars)