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I think your age definitely has something to do with how accepting your are of inches and mm.
At nearly 60 I was schooled in inches and then the metric switch came. I always use metric when measuring distance, height, weight but when discussing my telescope mirrors its always inches.
Historical value/significance and tying our hobby to its own glorious past. For instance the 200inch Hale Telescope on Mount Palomar. Sure its mirror is 5.1m but will always be known as the 200inch Telescope. Maybe as amateur astronomers that gives meaning/
comparison to our own telescopes.
I always refer to my scopes in inches, even at hundreds of school/public nights I have done over the years and nobody has ever questioned this.
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