That’s true for a lot of fonts but there’s no reason “x” shouldn’t have rounded elements.
bfontaine
1

Got your point now; “x” works not for all fonts, especially script ones.

I think this can be adjusted in the article. For example, I can add that if we are talking about the majority of interfaces, they utilize sans fonts, where this rule works fine :-)

Let’s also remember that “x-height” is a traditional typography term. Like a floppy disc still is the most recognizable symbol of saving.

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