Because the tool you use while standing at the aft end of the engine is passed through the fan (between the blades), then it pokes out a hole on the engine shroud and finally engages the adjustment point on the MFI injection pump. As you can imagine, going between the fan blades while the engine is running might be problematic.
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I have just bought a Carrera 2.7 european specs, with the MFI.
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Man, do I envy you.
By the way, what type of muffler is on your car? The reason I ask is that it's been mentioned many times before on 911 Technical Forum that MFI cars using aftermarket mufflers exhibit a flat spot at similar RPMs. You may not want to cover up this issue (if applicable) by richening the MFI.