Welcome to the same problem Arkansas has been having for years.
I didn’t realize this was happening in Arizona. I can’t imagine they won’t to lose money from hardware as juice too. They’ll go out of business just banning states from all their inventory. I’m sure some kind of computer code could separate juices from hardware hopefully.
Certain cities do. They either haven't had/don't want to take the time to fix it or don't want to spend the money for a cart system that can differentiate between San Fran and San Diego.
As I said, unfortunately this is the same wall I and other Arkansans have run up against. Online sales of e-juice is banned unless the the retailer has an Arkansas license. As mentioned above, why separate out what can be sold from what can't when it's easier just to block out the whole state?

Eventually some online sellers will fix their systems and at least sell equipment, Element Vape for one did.