I agree with this, the upside of a precision digital scale over a beam scale is definitely not more precision (at least for .01 grain resolution scales, you can buy .001 grain resolution digital scales which are more precise). On a beam scale, you can see the scale move an obvious distance with each granule you trickle in, so you can definitely get within one granule with a fairly inexpensive beam scale. You do have to make sure you're looking at it from the same point every time, but otherwise they're very repeatable. In fact, a 0.1 grain resolution digital scale is actually a downgrade from a beam scale in terms of precision. However, what I noticed is that fatigue sets in when reading that needle after loading 50-100 cartridges plus it's not quite as fast to reach a "balanced" state. I wanted a good digital scale for the reduction of fatigue alone, but faster to a result is also nice. And deciding what your accepted margin is a little more difficult. In other words looking at the needle you think 'now is that more or less far from the center mark than that cartridge 15 charges back?' With digital you have a number, for me +/- .02 grains is my margin I allow, much harder to tell whether or not you've met that margin on a beam scale, but I'll concede you can get pretty close.This sport already either attracts or creates a lot of OCD, AR type poeple. I get it and the fun part about shooting is the technical and details do matter. There is however a point of diminishing returns. Once we start buying into high priced, time consuming products that make absolutly no measurable difference in reuslt then we are allowing ourselves to be abused by the marketing arms of companies. $2000 scales to weigh down to .01 is one of those abuses. If you have one of these scales I have a test for you to try. Take your Lyman or RCBS balance beam, set it up correctly, clean the knife edges and knife pocket and mark you loading table with an outline of the scale to ensure it has not moved between charges being wieghed. Weigh ten charges, ensuring the balance beam is spot on the center mark. For even better accuracy you can attach a pin to the arm. Weigh each of those charges as you do them on your .01 scale and record the weight. I guarantee if you are using your balance beam right you won't have more than .01 above or below the target weight and most will be right on. I ahve done this test with a half dozen balance beams, and even the cheap Lee can hit .02 accuracy. So what this shows you is your expensive electronic scale isn't actually any more accurate than the balance beam, and with the balance beam you don't need to worry about dirty household current, temp, humidity or wind currents affecting the zero near as much. Balance beams don't "DRIFT" much if they aren't moved between charges.
So on top of the fact that they aren't materially more accurate than a balance beam, there is no documented proof that I know of that a .01 eoectronic scale will reduce ES or SD or produce better groups or less vertical at distance.