It's not like the first code of law has to be completely perfect. The entire point of instituting reform in the future is to change the laws. I imagine a fully codified system is a bit trickier to phase out, but it'd be worth it on the simple fact that the changes could be more easily spread around next time.
Except that would be an uphill battle, quite likely an impossible one, effectively stripping land from our entire population and giving it back to the state,