If the cartridge you shoot does not have "quality" options for brass, then turning necks might help.
Personally, I have seen lower velocity ES uniforming case neck thickness, but it was a point of diminishing returns. The load was was already accurate at closer ranges (~.5MOA), but I got vertical stringing at distance (~1000 yards) consistent with velocities measured over a chronograph. Fireformed Federal brass was sorted by weight. Velocity was measured for 10x low weights and 10x high weights, and velocities were consistently different. Neck wall thickness were inconsistent. Bullet seating pressure/feel was inconsistent, even on annealed/chamfered/dry-lubed necks. Bullet run out was not great, so I turned the necks to "clean them up."
The result was less vertical dispersion at the target at distance, lower ES, and more consistent feel sizing and seating bullets. If I had Peterson/ADG/Laupa options for brass, it probably would have not mattered as much.