alt Hacker NewsThe problem is that fractions suck to do math with. Rather than doing basic addition you have to do a divisor conversion and then do an addition. Heck, the third-pounder burger failed because a significant fraction of the American consumers believed it was smaller than a quarter-pounder!
And most of the kitchen stuff is a chicken-and-egg problem: the US used 1/2 cup because that's what it is used to, the rest of the world has recipes calling for 50g of flour. If the US was used to weight-based measurements everyone would have a kitchen scale with 0.1g precision lying around, instead of a bunch of measuring cups.
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You sound like an 8th grader asking the teacher when will we ever use this in real life type question. Fractions aren't that bad when like anything in life you are practiced in using them. Let's see what's faster in a kitchen, scooping something by measuring cup or trying to get a specific weight by 0.1g precision? I'm home after working all day trying to feed myself and mine. I'm not trying to win a start for my restaurant by the Michelin man.
These incessant arguments of "why is someone doing something different than what I'm used to so stupid" are funny if not tiring. Why not ask why are there so many different spoken languages in the world instead of just speaking like me? We could go into if Rust is better than Go, or why Romulans are better than Klingons. The problem is that nobody wants to understand the differences and just want to rag on the person opposing their views. Yawn
The only evidence we have for the “Americans were too stupid to understand that 1/3 was bigger than 1/4” story is from the memoirs of the A&W CEO at the time referencing some unnamed market research performed by some unnamed firm. A person who has a vested interest in explaining why their failure to turn around a sinking company was due to external factors beyond their control. It also implies that in a culture where every kitchen has at least one set of stackable measuring cups in 1/4, 1/3 and 1/2 sizes, and a culture where you would order meat from the deli counter at your grocery store in 1/4 or 1/2 lb increments was suddenly and completely incapable of remembering their basic fraction sizes when comparing the cost of a hamburger. Personally while it makes for a cute story, I really just don’t believe it.