I can relate. I was in grade school when the Metric System launched in Canada, and by far the worst part was converting Imperial to metric. These were fairly complex calculations for a child and the measurement had to be precise, for some strange reason.
What I've come to realize looking back was that it was all unnecessary. People can easily assimilate all things metric over a relatively short period. In the US people are easily using grams and kilos. Most know that 60mph is about 100kph. There is no need to know precise measurements considering that a foot or 12 inches is roughly the size of a Kings "foot"-- so who cares. Even the airline industry had difficulty "converting" that led to an airliner running out of fuel over western Canada (Gimley glider).
I don't begrudge the US taking it slow, so long as nothing is lost in translation so to speak.
Interestingly, personal height and weight are still casually addressed in pounds and feet all around the wold often times, although I'm not quite sure why the Brits insist on using "stone" for weight lol, but confusion about "pounds sterling" or currency might be the reason.
The US will get there eventually with the people, and I would say they really aren't that far behind Canadians.
The Metric System's beauty is its simplicity. It only gets complicated when one needs to think about how long a foot is, or how many stones equal a pound, and how many pounds equal a kilo.
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