React (and more specifically, JSX) highlighted to me that a lot of front end developers don't actually understand separation of concerns - many colleagues would complain that markup was with Javascript and it breaks SoC. After using it, and being exposed to the idea that functionality defines concerns more than language, I'd say the majority of the team have become a lot more aware of coupling and specifically cohesion (a lot of heated arguments around whether something makes sense as a HoC, inside a component etc.).
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React (and more specifically, JSX) highlighted to me that a lot of front end developers don't actually understand separation of concerns - many colleagues would complain that markup was with Javascript and it breaks SoC. After using it, and being exposed to the idea that functionality defines concerns more than language, I'd say the majority of the team have become a lot more aware of coupling and specifically cohesion (a lot of heated arguments around whether something makes sense as a HoC, inside a component etc.).