Uniform Neck Tension. How many different "lot sort's" of brass do you care to attempt to deal with? What I am getting at, is one of the reasons to either Outside Neck Turn, or Inside neck turn is to get all your brass to the same actual neck thickness for the sake of uniform neck tension. With Neck turning, for the most part, LESS IS MORE.... do not turn them down too far, just far enough to create uniformity.
Annealing every 3-4 firings helps with uniform neck tension as well.
Weight Sorting is less important than sorting by internal case volume. The Case Head and extractor groove can actually make up quite a bit of "Weight" that has nothing to do with actual case volume.
Trim to length, this goes hand in hand with your Neck Turning.
Flash Hole, IF you want to "uniform it" *LESS IS MORE* !!!!!!! use a good tool, do your Trim to length first, then set the tool up to just barely, barely touch flash hole. The fastest way to completely ruing otherwise excellent brass is to over do it on the flash hole uniform step. When in doubt, DON'T!!
Hope this did not come off "preachy",