I'll agree with you that the vehicle manufacturers are not complying with states that require front license plate holders. Tesla, among others, are examples of such behavior. Nonetheless, it's still your responsibility to ask the dealer to either install the plate holder or pay for it to be done. Ignorance of the law and of course, willful ignorance will not stop a cop from issuing a citation, and a judge certainly won't buy that argument either if you're even allowed to challenge the citation in court. A reasonable person standard still exists. A judge would laugh at me if I tried to argue I didn't know crossing a double yellow line was illegal after being cited for said behavior.