I do not think this is a good take. I buy kilograms of sugar, wheat, I measure my body weight in kilograms and I do not need these measurements to be accurate to one thousandths.

And yeah, I have bought a ton of something, coal.

It’s a ton (or metric tonne, fine) because people are just used to it, I wouldn’t have a problem if everybody started using megagrams, but most people wouldn’t even know what it means, especially elderly or people raised with SI but not “getting” SI (“centigrams? do you mean centimeters?”).

It’s just a well known alias, nothing else.