[timcobb]

> CSS-in-JS promised simplicity but delivered performance issues.

IMO it delivered said simplicity, and the performance issues are there, but they've never been the lowest hanging, biggest fruit to optimize. Not even close in my experience, which for me indicates a resounding success. And as a result, more "native" CSS solutions like Tailwind improved the native CSS landscape. So, wins all around for everyone: you can stick with CSS-in-JS and take the almost always practically invisible performance hit, or use newer solutions for improved ergonomics and performance.