Is it really React or the stuff it lets you bring in? Many React apps have at least one big widget set (say MUI or reactstrap or …) and then a number of “best of breede” components that do various things. It’s rare for components to be styled with plain CSS these days so you probably have to bring in Emotion and styled-components and Tailwind and …. It is all code that goes into the bundle and it’s a burden on your mind because these are all leaky abstractions and don’t absolve you of understanding CSS.

A someone who's been developing for the web for a living since the late 1990s, I agree that nothing absolves the web developer of the need to understand web fundamentals. But laying blame for bloated SPAs at React's feet is misplaced. With SSR, you can ship React apps that work with JS disabled. And with static extraction (a la vanilla-extract) you can do CSS-in-JS with 0 runtime overhead. Being mindful of bundle size and user-perceived performance is essential. For those that pay attention and leverage the web properly as a platform, amazing performance (and capabilities / UX) with React is achievable. See https://Remix.run.

Oh I agree. Was just addressing OP’s argument that surely React is as optimised and small as it can possibly be. I’m personally not convinced.