I got to web development pretty late (circa 2015) so my perspective may be skewed but CSS in JS seems much more natural to me than separating markup from style

I got to web development pretty late (circa 2015) so my perspective may be skewed but CSS in JS seems much more natural to me than separating markup from style and then linking them up later with global class names. It reminds me of when I was in college learning C where all of your code is just dumped into one namespace, and then later learning Python (or basically any other modern language) with actual modules and namespaces. After seeing it done that way it just makes no sense that it would ever be done the old way again.