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Why it hasn't changed yet ? Standardization. I assure you, having worked on the field for some time now, that changing the naming standards for tube diameters, fittings, nuts and the like would cost unbelievably more than you could probably imagine. Imperial system is the de facto standard in some fields. The only way to change it would be to keep using both systems for at least a couple decades. I don't like it, I don't think it's worth keeping, but it would take a great amount of time to make the change for a purely industrial perspective. Not that it's impossible or anything. People are just massively lazy in some things. It's just a matter of time, though. A century, tops.
""For every complex problem, there is a solution that is simple, neat, and wrong.""
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