Hey Tony,
the United States switched to metrics very early, much earlier than Canada. See here.
In the USA, metrication in legislation begins with the Metric Act of 1866. The first section is still part of US law (15 U.S.C. § 204). In 1875, the US became one of the original signatories of the Metre Convention. The US current law states that the metric sysem is the preferred system of weights and measures for United States trade and commerce (15 U.S.C. § 205b).
And metrication in the USA was a big success in science, military, medecine, manufacturing, etc… It seems that the people that don’t want to follow this step do mainly not belong to one of those sectors. One sector that practically did not follow is the construction sector. And the weather forecast.
You are right, I already mentioned that there is a thread in “Feature requests” where this discussion should belong.
By the way, the original poster of that thread and also Tom @Geige above did not ask to replace the U.S. Customary or Imperial units in the Onefinity technical drawings by metric units, but just to give the metric values additionally. So I cannot understand if people fear that someone is trying to take something away from them.