Simple: this isn't what Computer Science is about! A fundamental misconception about computer science seems to be that is is software engineering. This couldn't be further from the truth. CS is about algorithms: their efficiency, their provable correctness, and their applicability to actual problems. None of that necessitates version control.
Dijkstra said, "Computer Science is no more about computers than astronomy is about telescopes." It seems to me that version control, bug trackers, and wikis are about software, not Computer Science. These things are important, to be sure, but they're not Computer Science.