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Indeed, I am also surpised.
Telescope apertures and screen (TV, laptop, tablet, cellphone) diagonals are expressed in inches.
Despite 95% of the world population (incl Australia and EU) uses metric.
The only exception is aviation altitude in feet and speed in nautical miles (=1.852km other than US miles which are 1.609km each).
It is probably too much American influence, despite screen manufacturers are usually Asian.
Telecope manufacturers are in many cases American.
Another issue is that much software uses the confusing M/d/y date and AM/PM time notation and this confusion is not enough, as 11pm is followed by 12am, which is 23:00 resp 0:00.
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