The Sartorious weights powder to .oo1 gr. level. Is that necessary? The math says that it is not. A single kernel of Varget is .02 gr. That said, when my loaded ammo has the absolute least amount of variation possible, it gives me confidence in my equipment. If you think it matters, it does.
I have noticed that several folks with V3 and V4 scale/ tricklers usually mention how fast they are.
To me, speed is not a priority, only fidelity. The more consistent and accurate my charges are, the better. When u observe ur groups at 600 or 1000yds are N they are holding elevation, that is my goal. Es and sd at the target being single digits is the mark of consistent ammunition. My scale contributes to that goal.
one thing that has not been mentioned is the volume of the case u are shooting. A 6 mm BR or 223 will be more sensitive to powder charge variations than say a 308. So the smaller the cartridge, the more sensitive it is to small variations in any component wt.
and at 1000 yds, everything matters.