Speaking of Metric versus Imperial units (I worked 14 years for an American subsidiary of a British company and we were never allowed to refer to it as the 'English System') we had a sort of joke where I went to engineering school. At the time, this was back in the late 60's - early 70's, a US highway, US-41, bisected the the campus of MTU (Michigan Technological University), resulting in about half the classrooms being on one side and the rest on the other. Now I'm sure that no one planned it this way, but the buildings where you had your math, physics, chemistry, etc, classes were on the West side of US-41 while most all of the buildings where you took your engineering classes were on the East side. Now in those days, virtually all of the so-called 'science' curriculums, like physics and chemistry, were taught using the Metric System, while most all of the engineering classes were taught using the Imperial System. So the joke was that as you crossed the highway, you had to reset your thinking, from one set of units to another.

Today, students at the school, while I'm sure that there's still a mix of Metric and Imperial units being used in the different classrooms and labs, the 'joke' about crossing the highway is no longer relevant as they rerouted US-41 so that now most all of the academic buildings are on the same side of the highway and all but one of the dorms are now on the other side. If nothing else, it's a lot safer getting from one class to another than it was when I was a student there, although getting to your dorm could still be a bit tricky.

None so blind as those who cannot open their eyes.
Most (not all but MOST) of your industrial machinery is made overseas now. The factories who make it have to make two sets of machines - one for the US only because of your supposed need for Imperial measurements and the other for the rest of the world (and 2 types of packaging etc). This means they cannot reach the same economies of scale. If they made only one type of machine then their cost of manufacture per machine would be cheaper. So the US stubbornness is actually costing us all, including you, more per item. In a society that seems to value low prices more than most I would think you DO have a reason or need to change. Even for something like a hammer, which has no specific inherent metric or Imperial details, still requires different packaging for the US market. So higher costs.