[hugh3]

However it is absolutely true that a dozenal system would be much more convenient.

How is that, exactly? Even once we've solved the problem of convincing everybody on Earth that it's a good idea, and the other problem of going back and burning and reprinting every existing book, newspaper, film and inscription so that nobody need ever face the confusion of having to translate back and forth between old decimal and new dozenal numbers, what's the big upside again? That we no longer have to say "a third of a kilogram" and can just say "400 grams"?

[btilly]

That is one upside. Another is that the times table is much simpler to memorize. Another is that when storing round numbers of things, it is more likely that we'll have convenient packings. Another is that a dozenal based measurement system is convenient enough in enough places to justify using dozenal based time and angle measurements, making for easier conversions. (For instance in the metric system it is sometimes convenient to think in terms of km/hour and other times m/s. Converting between the two is a PITA. Using dozenal everywhere would make that conversion entirely unnecessary.)

There are many small details, but every one you compare finds conveniences for the dozenal system that aren't there for the decimal one.

However it is clear that the wins aren't nearly enough to justify the transition in any reasonable time frame. Which is why the dozenal movement is bound to remain an amusing curiousity.