Tbh, I saw that example in the post and thought "that's ugly but extremely usable; I don't think that belongs here".
Sure, it would be a little easier to use with some extra UI tweaks - e.g. aligned correctly (10x10 instead of 11x10), digits padded & maybe larger click areas - but the general idea of being able to click once and get the desired volume is pretty powerful: you can technically do that on a scale, but accuracy is tricky and the annotation isn't as detailed.
I'm not saying it's better than a scale (a certain compromise on granularity provides the optimum solution), but it's hardly a candidate for "worst".
Sure, it would be a little easier to use with some extra UI tweaks - e.g. aligned correctly (10x10 instead of 11x10), digits padded & maybe larger click areas - but the general idea of being able to click once and get the desired volume is pretty powerful: you can technically do that on a scale, but accuracy is tricky and the annotation isn't as detailed.
I'm not saying it's better than a scale (a certain compromise on granularity provides the optimum solution), but it's hardly a candidate for "worst".