I think you misread the parent comment. Dividing by 10s is easy, but useless. If you have a kilo of rice, you can easily divide it into two or even three equal

I think you misread the parent comment. Dividing by 10s is easy, but useless. If you have a kilo of rice, you can easily divide it into two or even three equal subdivisions, without scales or with primitive scales, if you trust the participants. And then you can divide the shilling that you paid for it into three. The advantages of the old systems exist but they have largely been superseded by modern technology and small currency subdivisions. (Remember that a new penny is worth a lot less than an old penny was, even though a new penny is nominally worth a bit under "tuppence ha'penny".) Not advocating the old system. I'm 100% metric.