This seems overly pessimistic. I work on a React codebase that uses only plain CSS files (no CSS-in-JS), and have never encountered any problems with that. Sur

This seems overly pessimistic. I work on a React codebase that uses only plain CSS files (no CSS-in-JS), and have never encountered any problems with that. Sure, there are certainly people who exclusively used CSS in JS, but I would hardly say that they are even a majority of frontend devs.