I don't understand those who claim they have never trimmed their pistol brass.
When I seat a bullet, I want every crimp to be identical in the cannelure.
How does one achieve THAT - if their cases are a mix of new cases along with cases that have been fired any number of times, between once and twelve different times?
When I seat my bullet and then put a taper or roll crimp on it, I want all my cartridges to crimp the same - and I surely do not want to be sorting my brass by length as it would take me less time just to run it all through my trimmer than sorting it all out! As it is now, my dedicated crimp dies are all set up for each caliber, I never need to adjust anything as the cases are always the same (give or take one or two-thousandths).
I reload for several reasons, one of them being that my reloads are more consistent than factory loads. If I never trimmed my pistol brass, I could no longer state that my reloads are more consistent than factory loads, because they simply would NOT BE!
I could compare it to cleaning my guns. I could just wipe them down with oil after I shoot them, and many times, I do. However, it does get to a point where I must clean inside the bore to remove lead and copper fouling. To me, stating that one never, EVER, trims their brass is like me hearing someone say "I never have to clean my bore, in fact, I don't even own a cleaning rod -- I just wipe the gun down after use with an oily rag!"