Probably because they don't all exist on discrete server boxes anymore and this is all virtualized and the script is working in multiple filesystems... cuz that would be the crazy zombie mess that this game probably is by now. And it was probably engineered by 10 different engineers. Who didn't talk to each other. I believe it's implied and admitted that it would have worked well if they had planned that from the get go. But it didn't go down that way.