Neither of those statements is at cross purposes. There are dual standards in the US. A merchant can CHOOSE which method to use or he can CHOOSE to use both. For practicality, most chemists (not pharmacies in the US) sell their chemicals by the gram, kilogram or tonne. Some don't. They sell by ounce, pound or ton. The point is that they can sell using either standard and do so legally. But, now here's the part you don't really get, they CANNOT sell without having ANY standards applied. Well, not legally. I could sell a handful of anything but if you wanted to question the sale later by stating that my handful was an illegal measure, you'd be in the right. Such is the standards system and why it's there. Acceptance by the general population isn't at all relevant or to the point. It's just you reaching for a single thing you can call a win. This wasn't ever about the hoi polloi embracing metric or Imperial. You just try to steer it that way. It won't work.
Let me ask you something. Can an item be sold in ounces in NZ? Legally, I mean? Forget that nonsense about whether or not you can convert it correctly. Just the simple question. Can an item be legally sold in ounces in NZ?
-- Ray