[Synchro909]

It should come as no surprise to anybody that we all feel most comfortable with what we grew up using. In this country when I was a kid, it was the "proper" imperial system. (The American imperial system is different - WHY?.) Then, in the 1960s, we converted to metric. That caused some people, especially the older ones some temporary difficulty but it wasn't long before everybody was comfortable with it. Nowadays, younger people - younger than in their 50s, can't believe we used such an awkward system. It makes no sense to them at all and I can see why.
My career was a Licensed Land Surveyor and when I started, we used to have to work from plans and land titles often a century old that were in links and chains - another almost metric system. In those days, we worked in feet and decimals of a foot. It takes me a second or two to convert a dimension from inches to decimals of a foot, even today - 50 years later. It has been many, many years now that we have all used metric and I can jump from links to feet to metres and back again like flicking a switch. The same goes for gallons and litres, degrees Fahrenheit and Celsius. I am quite at home with them all except some of the American version of imperial (because it was never used here).
Obviously, it is difficult to become proficient in another system when almost everybody around you is using something else. IMO, if there were a genuine attempt at change over there, people would adapt quickly and you'd be better off. We did and we are.