A glimmer of hope

[NortonDommi]

Neat graph. I wonder how many people know that B.C. several bases were used? As to language every trade has one, usually specific to its own needs, boatbuilding for example measures are feet - inches - 1/8". Very easy to call out with no mistakes. With the exception of fine interior finishing the system works and works well.
Just fit the maths to what works easily and what you are comfortable with.
Being confined to one system can lead to things like buying a 3/8 BSP plug when the staff of a plumbing department including the recent immigrant head of department in the big shed outlet tried to sell me a 10mm plug because "10mm & 3/8" are the same".
Working on old machinery I come across all sorts of threads and it is a challenge and fun to suss things out. The brass , Copper and bicycle trades had their own standards, so did the Admiralty All for good reasons based on decades of experience with the materials and sizes they used. Very easy to refer to the appropiate standard. Metricery can be a nuisance to especially when dealing with stuff made by those damn French who started the whole mess with a metricery system that is different from everybody else.
Variety is the spice of life and could be why dementia is increasing as we homogenize everything.