@insanejedi: Your base 10 counter argument is both true and completely meaningless. Yes, there is no inherent benefit to the actual metric units themselves. You could have used imperial base units in a metric style system, but this is not how people use imperial units. Road distances are given in miles, not kilofeet. The strength of the metric system comes from the fact that people actually use such a system with base units and modifiers in powers of 10. Not a series of completely different units for each quantity with seemingly random conversion factors.
Also the notion that having more divisors is better makes little sense. The whole point is that we as humans use a decimal (base 10) number system, so having conversions which are multiples of 10 makes things as simple as possible. Converting 411 feet to yards is more difficult than converting 411 centimeters to meters even though the answer to the first question is a whole number. Dividing 411 by 3 takes conscious effort. Moving the period two places to the left does not.
Also saying a jet crashed because someone screwed up the conversion from imperial to metric is a very good argument for switching to metric. If the entire world used one system of measurements, such conversions would not be necessary.
I could go on....