The major issue with this is that modern CSS is almost its own job, to the point we used to have Interface Developers at some place I’ve worked (HTML+CSS specialists). I did frontend for over a decade and eventually lost the train on CSS changes, I don’t even know what’s going on there anymore.

It’s still awesome, but it’s becoming increasingly silly to ask someone to know modern HTML, CSS, JavaScript, Typescript, some build tools, a couple of frameworks, etc.

The amount of JS we ship to clients is a reflection of cost-cutting measures at your workplace, not that every FE dev shuns CSS.

When I started dabbling in web development, writing HTML and CSS was already its own job, and professional JavaScript developers basically did not exist. This was before TypeScript, before Node, before Ajax, before React or even jQuery. If anything has exploded in complexity in the intervening years, it's the JavaScript part of the equation.

I agree that it's increasingly silly to ask someone to be an expert in all of frontend. But the primary driver of that is not all the new CSS features we're getting.