If you are building a small webapp where the difficulty is in WebSocket, updating a small user interface, etc... then maybe. But some sites require different things. You can't run a large eCommerce site with hundreds of sections/styles and not use CSS preprocessors or CSS architecture.
CSS could get more sophisticated than any React work. You can fix yourself with small patches but if you have thousands of pages this can't happen. It becomes suicidal and unfixable (you'll need to rework the whole CSS to SCSS and have a CSS architecture).
CSS could get more sophisticated than any React work. You can fix yourself with small patches but if you have thousands of pages this can't happen. It becomes suicidal and unfixable (you'll need to rework the whole CSS to SCSS and have a CSS architecture).