Metric vs. other measurement systems - chart

[NortonDommi]

This argument will keep raging until the entire world kneel down before statues of Stalin and all sanity has been annihilated.
It does not matter what system you use as long as everybody doing something to work on a project ALL use the same standards. Growing up with Imperial, having the country change to metric at age 9 I had to go through school and sit all exams including Trade exams in both.
Some things are just quicker and faster using Imperial, other times metric is easier.
As there is a huge amount of old stuff in the world which occasionally has to be worked on is reason enough to be conversant in both. This Irish guy might be of the bog variety, certainly dumbed down by being raised with only metrickery.

Here is some good information that helps explain a few things that you will never be taught in school today: Weights, Measures and Volumes of the Ancient Mediterranean