The problem with all those non-front license platers is the problems they cause and they can't be identified... Hit and runs (hell, even with a Sentry capture - no front plate = you're screwed because it sure as hell won't grab the rear plate)...
Definitely don't agree with lack of front plates and feel those that are violating the CA vehicle code should be getting ticketed all the time... Do I like have the front plate on my X, no... But, I put it on there.