I'm not done
If you're not a baker, or you don't understand what the problem is here, the usual complaint against US-style volume measurements (cups, tablespoons, etc) is that they're "inaccurate" compared to metric. This actually isn't true: "cups" and "tablespoons" and so forth are standardized units of measurement.
Where the "inaccuracy" allegations are TRUE is when you compare volume (cups) to weight (ounces). The reason for this is that some ingredients compress, which alters the weight.