I worked building some machines and it was a German company who sent a German engineer to help - his head almost exploded over our sockets and nuts and bolts and machine screws, and sich - it was a riot - but he was pretty smart and got kind of used it
There are TWO points of contention here. First, the metric system has the appearance of being neater because the Meter is a more “abstract” standard than the “Yard” is. In addition, the division and multiplication of the abstract “standard” is cleaner and neater, being all in increments of ten. I’ll grant that this “neatness” is real and easier to figure out “across the board.” than the so-called English system of weights and measures.
That being said, the second point of contention is about the actual MATHEMATICS. Decimals are for dummies, fractions are for poets.
You realise a fraction and a decimal are essentially one of the same right? Any decimal can be written as a fraction and vice versa.
Mathematically speaking, it’s easier for most people to work with decimals because the simple grade school rules of addition/subtraction/multiplication/division apply rather than the additional set of rules that come with fraction calculations. I would argue that metric calculations make things simpler which causes fewer mistakes.
Being Canadian and the age I am (in my 30s), I grew up with both metric and imperial measures. I have no problem with feet and inches because we use it not only in construction but in our height notations. I’m 5’9" and don’t ask me what that is in meters. Weight we generally say in pounds not kilos. We use fl.oz frequently. Etc. Our temperature is in Celsius and our distance and speed is in kilometres. It’s a weird mix.