It seems like a weird point to bring up. How often do y’all convert your measurements? It’s not even a daily thing. If I’m measuring something, I either do it in inches, or feet, rarely yards. I’ve never once had to convert feet into miles, and I can’t imagine I’m unique in this. When I have needed to, it’s usually converting down (I.e. 1/3 of a foot), which imperial does handle better in more cases.
Like. I don’t care if we switch, I do mostly use metric personally, it just seems like a weird point to be the most common pro-metric argument when it’s also the one I’m least convinced by due to how metric is based off of base 10 numbering, which has so many problems with it.
Edit: After reading/responding a lot in the comments, it does seem like there’s a fundamental difference in how distance is viewed in metric/imperial countries. I can’t quite put my finger on how, but it seems the difference is bigger than 1 mile = 1.6km
Testing and validation are very important, but they’re no replacement for structurally making mistakes as impossible as possible to make in the first place. In fact, that was the conclusion from the Gimli Glider incident, that using mixed units increases the likelihood of mistakes being made, and so they stopped doing that. It’s kind of absurd to acknowledge that people make mistakes and therefore their work needs to be validated, but when the people doing the validation also make mistakes, they get all of the blame even when the people who made the thing did things in a way that increased their chances of making mistakes when they could have chosen not to.
Also, that’s some contrived scenario you’re painting.You make it sound as though every machine shop in the US would have to replace all of their equipment. First of all, for anything computer-controlled the units are arbitrary and software-defined. But even for purely (electro-)mechanical machines, it’s not like those can’t be (and aren’t already) modded up the wazoo. Why replace the entire machine when you can just swap out some of the gears or even just the dial? If a machine has been around since 1945, they’ll have done things like that many times already.
Of course no transition is going to be instant or painless, but it’s better than keeping up this situation forever. I mentioned two incidents because they’re the most dramatic, but things like that happen every day and the cost of lesser incidents also builds up. Somehow, almost all of the rest of the world managed to go against centuries if not millennia of tradition and momentum and transition in a fairly short amount of time during a period when precision engineering was already a thing that happened at a large scale, but the US is special? Give me a break.