I tend to think of the UPP as an abstraction, which has only a couple of functions: to provide die roll modifiers and to give a framework for a character's personality and mannerisms. I suppose the actual 6-digit code can be found in databases, but most people wouldn't find it useful in day to day life. On a high-tech world it might even be tested and assigned, but, like IQ scores, the value of them is debatable.
A mechanic I'd like to try some day is for a player to claim an exception for a stat. "Sure I have Dex 4, but that means I can't walk in a straight line without falling, yet I can sort tiny screws in space exceptionally well." It might result in a special die modifier, plus another to counterbalance it: player gets a +1 for fine motor control, but a terrible penalty if ever handling a bladed weapon.
