I see this a lot: that people creating CSS-in-JS libraries just don't know CSS well enough to solve their problems. I work with the people who created Radium. T

I see this a lot: that people creating CSS-in-JS libraries just don't know CSS well enough to solve their problems. I work with the people who created Radium. They made it because they are extremely experienced CSS developers and do understand what's wrong with plain old CSS. I highly recommend watching this talk by one of the creators; it's kinda long at 36 minutes but answers all of your questions: https://www.youtube.com/watch?v=k3OF4A30jSQ https://www.youtube.com/watch?v=k3OF4A30jSQ "Throw in CSS Modules" – that is indeed a decent answer today, and the creators of Radium love CSS Modules. But CSS Modules are what, 10 months old at most? CSS-in-JS concepts and implementations are more mature than that, and get you some further advantages like dynamic, runtime computable styles.