Where there are out and out errors in the OOB we fix them in the updates. (on a side note, everytime a new game is release with new features we update the entire line back to the first game with the new features) But we have not gone back to completely redoing the OOBs of past games. We are always working on new games (there are about 6 in the works at this time), and that seems to take up all are free time. We all do this as a hobby while working full time and having a family life. Oops I just remembered, I had gone back and redid the OOB for Smolensk 41 to bring it in line with the German breakdown to companies and completely redid the Soviets as they were not corret but that took much time and was released as a free expansion pack.
If you like the SPI Panzergruppe Guadrian game which was there battlion level system then you will love these games as they are based on the system. John Tiller was a hugh fan of SPI as I am myself having grown up in that 70s time period and living in NY where SPI was located.
If you are interested in OOB's then I would recommend Stalingrad 42, Minsk 44, Tobruk 41, Rzhev 42, Normandy 44, Smolensk 41 (with XP2 pack) and Korsun 44 as some of the best OOBs