They probably weren't finished yet! Everything else they had working probably worked perfect, and they decided to ship what they had and add the extras later with no fee.
How is this an issue with people? Of course everyone would prefer to have them during launch, but I would take an incomplete versus earlier rather than waiting an extra 4 months to get the full package especially when there are no fees involved.
hmmm aaron if my memory serves correct weren't you one of the Valve haters along with Zmatt and Rican? Valve has more then proved their dedication to their customers and their games, I mean heck look at TF2, at 1.5 years old its still getting updates and new content...thats completely absurd...I mean EA charges $10 for 3 BF2 maps for god sake...
PS: Valve originally stated that death toll and dead air couldn't be versus maps because of the very open ended areas would make it really hard for the infected to bring down survivors. I'm guessing in their modifications they added a lot of objects to narrow the survivors path more and make them more susceptible to being ambushed to make the maps balanced.