It’s mostly just people like to attack conversions no one really does. Even with it’s nice easy conversions, the average person isn’t going to tell you how many nanometers are in a megameter, which isn’t qualitatively different than barleycorns in a league.
Science also just invents new units of measure when it’s convenient, light years, parsecs, astronomical units, moles, etc.
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It’s mostly just people like to attack conversions no one really does. Even with it’s nice easy conversions, the average person isn’t going to tell you how many nanometers are in a megameter, which isn’t qualitatively different than barleycorns in a league.
Science also just invents new units of measure when it’s convenient, light years, parsecs, astronomical units, moles, etc.
Moles are real, not invented by science!