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I don't think there's any debate on crimping pistol rounds. A light taper crimp for autos, a roll crimp for revolvers.
Depending on the caliber, the FCD should have the correct crimp type for that round, but you don't need it because your Bullet Seating Die should also apply the correct crimp along with seating if you set it right (my 9mm set does this).
The FCD can also be used to post-size a completed round. I guess it also has a resizing ring, to iron out any bulges that would prevent chambering, but it's regarded as a practice to cover up sloppy reloading.
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