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The margin for error with a long eye relief scope is much greater.
For instance, with my 2X Leupold, I have an effective view of the scope with no shadow from 9″ all the way to 19″, but they call it a 9″ eye relief scope.
This is very common. The manufacturers call out the minimum eye relief available, but lets be real about the way things are, and how light disperses.
In contrast, take a Leupold VXI 3-9X40.
At 3X magnification, the margin for correct eye placement is 3″-7″, but crank it up to 9X and your eye must be somewhere between 3″ and 4″ from the lense. Thus, the level of magnification directly correlates to the difficulty the shooter will have snapping into the correct place quickly.
Add to that what has already been said about the optic being inherently dimmer with higher magnification, and there you have it. .