Sending people fines in the mail the nanosecond their stuff expires sounds pretty darn dystopian to me. I know most here are well off enough that they've never had to <clutches pearls> drive without all their papers in order but it happens.
That's the law with or without special cameras that are only there to enforce the law.
If you get caught by police instead you will also get a fine and they will seize your car as a bonus. If you get caught by those camera vans while parked they will clamp the car.
Likewise, if you are wanted you are liable to be detained the instant police recognises you. It's just that the process is very inefficient at the moment because it relies on being recognised by police. In practice it means that they have to specifically be looking for you.
I don't live in western Europe (thank god) so the police here don't impound people's means of personal transportation at the drop of a hat so you get the same fine the camera would have handed out with the opportunity to get out of it if you are genuinely being reasonable.
Also, we don't need to send any paperwork. For road tax they send a reminder a month in advance and you just need to pay online. Same for insurance (there really is no excuse for driving without insurance).
These sort of stuff tends to discriminate against certain segment of societies, like you are let go if you are white and fined if you aren't