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I think the greatest advantage of the SI system is that it's exponential. I don't care that much about what base is used, but switching is just confusing (12" = 1', 3' = 1yd).

Pi is better then tau because all of our damned engineering formulas have pi. SI is, however, the right answer (though useless without reference tools, whereas imperial isn't).

Ok, but "...a lot of useful expressions..." sounds like an anthropocentric argument as well.

Anywho, the point stands. They're simplifications for our benefit.