Cannot disagree more 😃 Have you been working with these on a bigger-scale project? CSS-in-JS are a breeze in terms of development speed, code readability and maintenance, and are also a lot easier to optimize. Creating clean CSS, without much duplicate code and with some kind of organisation is a pretty hard task.
Also, when the - almost unnoticeable - overhead is a problem for you, you can always use some of the zero-runtime CSS-in-JS libraries.
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