It was developed over a long period of time based on practical everyday units of measure that everybody had access to, in a time when high precision wasn’t needed or possible. They changed systems much later, when most of the world was adopting a different standard, and the change was coordinated and implemented by the government.
It’s not like a group of people developed the Imperial system on Monday and then changed their minds and abandoned it on Tuesday. The two decisions were made by different groups of people at different times.
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