Well the issue is that something like shooting laser beams out your ass is physically impossible. But we're interested in whether people's motivations and decisions come from some entity (i.e. that our "self" is independent of our brain), not whether they can shoot lightning out their ass. So dividing the two processes into will vs. What you do with that will is helpful for understanding what we're really after.
For instance, we may have free will (we magically decide things in a whim) and still not be able to shoot lightning bolt out our ass, so whether or not we can shoot lightning bolts out our ass doesn't really tell us anything about free will. We still have to determine where the desire to shoot lightning bolts out our asses came from in the first place.
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