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As stated in https://github.com/facebook/create-react-app/blob/master/packages/react-scripts/template/README.md#adding-a-css-preprocessor-sass-less-etc, CSS preprocessor is not so useful in React's component-based approach but often causes unnecessary effort in browsing and organising separated SCSS files. So far, the only place I find it useful is when I try to implement Bootstrap's Reboot library with variables, which should be easily ported with PostCSS's postcss-cimple-vars plugin.
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