I think that the imortance and the intent of factory codes were part of a bygone era, where there was more time to produce the amount of quantity to match demand.
I think that the main reason people ever gave any concern what-so-ever was because there was a code on the bottom of the box. NIVELACUSO became something of a game because it also started to carry the factory as well. It just gave us something else to gloat over. Take these two as an example:
1985-1998 SS meant Sancti Spiritus
1999 the previous designation of SS now could be from any of these factories:
CEG Arroyo Blanco
COT Cabaiguen
CGI Fomento
CNI Guayoa
CTO Jatibonica
CUN Perea
CID Sancti Spiritus
CDU Taguasco
CAC Trinidad
CCA Zaza del Medio
SO even though NIVELACUSO was fun trying to get a certain year, it only clued us in on about 15 factory codes to choose from. The 4 month span of NETAGIDOCU and the 8 months of (xx)OO opened up the factory count to 60+ different factories broken down by provinces.
The main thing about factory codes is that it's supposed to be an internal accounting method and nothing more than that. We should care about the dates because that's what is what remains important to the hobby.
Every few years or so Habanos tries to push out a new strain to test the market reaction, Hurricanes and othe enviormental hazzards will have an impact, your own tastes will lean towards one crop over another...(but that would be more encompassing than just to one marque but more unilateraly. If the 2004 VR's are really good for you, I would bet that the Upmann's would be equally as good...even if you didn't care for the marque too much before.)
Hopefully you'll remember this when it comes to factory codes:
A bigmac in Indianapolis will invariably taste the same in Ventura.
The reason is strict control pratices and training, modernization and training, working out the kinks and training.
Okay...that was a bit wordy.
-Rob