A wee bit of common sense
Due to all the extra PV, the daytime usage is down, but the night time usage is not. People still want to cook and watch telly while the the sun isn't shining.
So they really want you to increase your daytime use and not your night time use. That flattens out the demand curve too, which allows big generation plants to operate more efficiently.
When are you going to want to charge your car? At night surely, while you're at home.
The only way to get daytime charging up to any significant level is by fitting charging stations in office car parks, malls, etc etc etc. That's a hell of an infrastructure that would make the whole smart meter fiasco look tiny. Lots of gravy for the industry.