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.
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