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.