Mandating the metric system
But far more important, the very thesis of in the US, which does not allow me to purchase metric tools—despite my desires as a consumer.
One simply cannot readily purchase metric-only, mm-only, tape measures, and other tools in the US.
Metric measures in weather broadcasts also ended in the late 1970s.
I would like to see snow and rain totals in millimeters, but I do not have that choice.
The choice of only miles and feet (in vulgar fractions no less) on US road signs was decided by filibuster, in 1978, by Senator Charles Grassley of Iowa.
The details of how this mandatory requirement for miles and feet on US road signs came about, may be found in weather broadcast in the US?
The public teachers of the 1970s began to teach metric, but quickly realized that the US was to be the only country (other than Liberia and Myanmar) which had a government that would not institute a true metric conversion.
The teachers were left without a measurement ecosystem outside of their classroom to which they could teach, and so metric instruction was “all dressed up with nowhere to go.” Metric instruction has become perfunctory.
They are the same tools that are used in metric building construction, which the US government has quietly abandoned after the 1990s.
What possible context makes the measurement of human feet require barleycorns as a unit? You cite examples of multiple units which are in use and describe the same quantity as something wondrous which we should lionize.
This is not an advantage, it is a called unit proliferation.
If it is not allowed right now, then metric only is obviously not a voluntary choice for industry. It does not support your thesis that everyone has a choice.
That measurement units need “context” for meaning, and are chosen depending upon the given circumstances is nonsensical.