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As far as I know, most of the successful MMOG's, or exploit free ones, never allow client modification, so I'm actually very surprised that so many of you are actually surprised by this decision.
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Everquest allows client modification within limits. You can install third-party maps or change your UI to your heart's content. You cannot use any macroing programs or client emulators.
And, you know what? That's probably the best thing about EQ right now. Hate your UI? Download a new one. Don't like the ones available for download? Learn XML and mod it yourself.
For all SOE's faults, they know the difference between a hack and a benign mod.