An interesting comment about engineers living in the past; the ones I knew who preferred imperial measurements have mostly died of old age by now!
Don't Engineers retire in the Emerald isle?
Or do you just have them stuffed and propped up at meetings?
There were so many oddities about non-metric measurements!
Like units of less than an inch being barleycorn (if anyone remembered it existed) and fractions or thous. That is, either using a system which was somewhat awkward or dumping you into metric. How many, even of us who went through it all, could readily recite the measurements from zero to one as sixty-fourths, thirty-seconds, sixteenths, eighths, quarters and halfs of an inch?
Even now, we see major corporations, such as Apple, referring to their 12.9 inch screen iPad! A good mix of non-metric and decimal in one measurement.