The Separation of Concerns in C S S and Js

For me, i have mostly been in thes ss and sass camps. I dabbled really briefly in c s s and j s. But at my last job, we had to make a decision wan we were building a new react application. And one of the other staff engineers on the team was very much in the separation of concerns camp. So i i like keeping it separate, personally, but i know that that's just a very personal opinion that a lot of people have different feelings about.