A common theme on this list is to redefine traditional units to new metricated sizes, like the messages in current thread advocating redefining cups to 250 ml, or previous suggestions to redefine a pound as 500 g.
I think this goes 100% contrary to the goals of the USMA. Possibly the greatest defect of traditional measures is that they have different sizes in different places and contexts. Redefining them doesn't make this problem better - it makes it worse. All old documents, measuring devices, recipes, etc. will still all be referring to the older definition, while newer measuring devices and documents may (or may not) refer to the new definition. But the different sizes will have the same name. The result is chaos! The solution is to use modern metric measures. Grams. Kilograms. Milliliters.
