Your reason?
Edit: Well from the votes and reading of most comments, I'm thinking people like the predictability of enemy movements. Know where the enemies will be so the action can start faster and less camping because of fluctuating zones. Thanks for the votes and comments.
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The reason that enemy locations are so predictable is because people will take the most direct path to the zone. If you don't like being killed in the same spot every time, FLANK! It's not that hard!