You see, this is part of the problem. SI seems more logical on paper, but in practice if you want to divide by anything other than 2 or 5 you have to pile on the decimals or switch to an unwieldly small unit of measurement, which hampers the ability to use those measurements. The most commonly used “standard” measurements are the way they are because they were the most useful measurements for actual craftspeople to standardize to, while the SI system was dreamt up by a bunch of rich French people.