And they are too expensive for most people.
The other thing that may be a problem is older neighborhoods don’t have electrical infrastructure to carry large loads. When someone builds a large home there they have to pay the power company extra money to upgrade the electrical system.
I don’t about that. My new solar system plus 44kwh of batteries only cost about. 60K. In other words..you are exactly right! The only good news is I can go off grid in a practical sense if I have too to charge my EV.