It's hyperbolic but it's a common sentiment that I tend to agree with. The web dev world changes too fast and too often, many stacks involve absurd complexity for dubious performance and maintainability and other metrics.

I've been doing web dev for 20+ years. Which part is wrong?

It's not hard to find feature support or implementation differences between browsers. But these days, that's not really the problem. I can go read the ES language specification, and generally find user agents/node/deno/bun have compliant implementations.

The problem is brittle "ecosystem" stuff. How are the create-react-apps going? How is module bundling going amidst the UMD/CJS/ESM war?