True, but, there is a HUGE difference between a benchrest rifle and the common everyday hunting rifle! Comparing what makes a high dollar benchrest rifle shoot its best to a off the shelf hunting rifle is apples to oranges, sloppy this, sloppy that, etc.
For one thing the benchrest shooter can seat his bullets out to the lands to give him the constant pressure he is looking for. Many hunting rifles do not allow enough room in the mag to accomplish this. Using the Lee Factory Crimp Die can and does help with a more iniform pressure curve and less velocity variation which can and does help accuracy.
I have a Lee Factory Crimp Die for all of my calibers. It improves accuracy in most and little of no change in a couple, none however have lost accuracy by crimping with the LFCD.
Here is some interesting reading on crimping with the LFCD.

http://www.accuratereloading.com/crimping.html