Transpilation. Imagine if TypeScript/JSX was available native in the browser requiring no transpilation step, and we dropped support for any package requiring

Transpilation. Imagine if TypeScript/JSX was available native in the browser requiring no transpilation step, and we dropped support for any package requiring some exotic transpilation. You could easily step through your entire codebase first and thirty-party without battling source-maps or minified files. Libraries that required adding a compilation step and a complex dev server would be shunned. Having this compilation step in place means it's easy to just pile on tons of functionality, import hooks, AST transformations, etc. which causes the complexity.