This is an overly broad statement. In the last year, for example, I've built an in-browser SVG vector drawing tool and a very detailed dashboard with a lot of nested charts and data visualizations. Neither of these would have been possible without a heavy client-side JS component.

My current project is an e-commerce app that's almost entirely server rendered. I avoid JS where it's not needed but also avoid irrational biases against it when it is needed.