Why aren´t shoesizes measured in a normal life measurement?

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Why aren´t shoesizes measured in inches or centimeters, but instead in 10, 37 and so on depended on where you live?

I got two kids and always when we need to buy them new shoes, we take out our measurer and check how long their feet are. And then you have to go to a site or even the manufacturers site to see which size of shoe to get them. Feels very complicated

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