If you are shooting a factory chambered rifle,neck turning could cause early neck splitting.
No necessarily and especially if you first sort by neck thickness (less than .002) and then only trim 2/3 of the neck.
This will eliminate excessively thinning the case necks.
Sorting by neck thickness will reduce the amount that needs to be trimmed and only trimming 2/3 of neck keeps a reference point on the thinnest portion of the necks.
If the necks with zero variance average .013 and you sort to have no more that .002 variance the high and low will be .014 and .012. When you trim just 2/3 of the neck the trimmed portion will be in the neighborhood of .0125 which is just .0005 thinner than the cases with zero variance.
This is less than a neck with .004 variance which has a high side of .015 and a low side of .011. If you trim necks with this much variance you will have thinner necks and especially if you trim 100% to .011 or beyond.