I'm not sure about the photobashing thing.
If I remember correctly a generated image starts from noise and the AI refines that noise to form shapes. When watermarks show up, it's not because it's bashing the original images, but because it learnt to put watermark on an image.
You'd still need "gas stations" to recharge this battery in 10 minutes.
The charging current required for a battery like this would be in the high hundreds of Amps. Not something you can pull out of your wall.
Another thing with at-home charging that I don't see much discussion around;
In 2035 the EU will stop the sale of combustion engines, but when everyone drives electric, how will the electric grid handle millions of cars suddenly being plugged in at the end of each day?