One shouldn't harmonise for the sake of harmonisation
I agree entirely -- Which is why there is no need for America to change its wire sizes at all.
AWG has been the standard in the U.S. (and beyond) for decades, and introducing a new system would result in unnecessary confusion.
It seems to me that the ROW (Rest Of World) is frequently berating America for not falling into line with "established international standards," whether those standards are electrical or anything else.
I see the situation from the point of view that America already has its own standards which are perfectly satisfactory and understood right across the country. (And in many cases, the American standards have been in use much longer than the Johnny-come-lately ROW standards.)
If it ain't broke, don't fix it!
