for close range general shooting I don't weigh my cases... but I am pretty annal in my loading procedures... I do trim my cases accurate to a couple thousanths, I do sort my brass by brand, even on general purpose handgun rounds... my CASS lever action 45 Colt rounds are the same used in my revolvers, & they are always the same brand of brass, & trimmed to tight tolorances ( I use a file trim die... slower to use, but find I can get tighter trim specs using it than power trimmers )
for long range stuff for example my heavy barrel 223, I use milspec ( lake city ) cases, sorted by lot number & weight... I'm confident my rounds shoot more accurately than I do... but I have my own 300 yard rifle range, & routinely like to shoot ( sitting at my bench ) out to 300 yards
In life you either make dust or eat dust...