And my testing and the testing of many others has proven that not to be true. You can load with less neck tension, almost none at all but keep the bullets from walking by simply crimping.
Bench rest guys have been loading rounds so loose they'd all but fall out of the case for decades because they find it more accurate. Adding a crimp allows us to do the same thing without any worry of bullet walk.
I can literally load my rounds with my fingers and then just run them through the die for length, set the crimp and run.
I didn't believe it either until I tried it and compared the same exact loads, loaded traditionally, shot in the same rifles and significantly tightened up my groups ES, and SD down into single digits.
I've been shooting pretty well for decades and I'm shooting tighter groups today since starting this process than I've ever shot in my life using the exact same components and rifles.
Quite a few others have had similar results.
I might actually consider going back to that if 1) I could not get the accuracy I expected which is pretty high standards and 2) could not get the es I was after(which is really a waste if the vertical is non existent at long distance). I have tried every method I have read just to see for myself. I stand by every statement Ive made in this thread. If you are getting the results you desire great. I can assure you it is not the norm, especially as you stated, or benchrest guys would be doing it and make no mistake about it what they are doing absolute matters to long range shooters. 1)If you are not getting the accuracy/es you desire or 2) bullets are moving then you are doing something wrong. I am no rookie to this game. I have no problem getting my loads consistently under .5 moa vertical at distance. If you claim you are better than that then you are lying or should be wiping the floor in competition.
Look I don't have time to waste arguing. I think the OP can make a decision based on the reading in the thread.