Thing is, you can stick a tube into any grinder that has been specifically designed to be hopper fed, then claim it is fit for single dosing. Usually it is not. If you use it as designed, by putting beans into the hopper then the weight of beans pushes the beans into the blades. You top up the hopper daily to create this weight. If you drop a tube in with 20 gms of beans,. there is nothing to push the beans through so the uniformity of the grind will start to vary. In addition, unless you adopt some sort of puffer system then grinds will be retained and probably exchanged. Back to the niche, it has none of these problems!