

Water is based on meter? They drank only wine in the dark middle ages, Lavoisier invented water, I knew it!
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The point is your proposition doesn’t make any sense, read the definitions of other units, not just meter, from the 2019 si standard. Lightsecond would become a nice round number, but e.g. 1 lightyear is 31557600 lightsecond so there you already have a strange number, but it’s based on the rotation of Earth, a constant you cant redefine.
How do you syncronize it between multiple devices and operating systems?