Just no. Browsers operate at a scale never seen before. Imagine all the extra energy and bandwidth needed if core functionality is moved to the application cod

Just no. Browsers operate at a scale never seen before. Imagine all the extra energy and bandwidth needed if core functionality is moved to the application code when you have billions of users. What we need is more native functionality (implemented in the JS engine with C++ or Rust) to have as less user land code as possible. As an example, imagine how much energy, bytes, and CPU would be saved if browsers and JS engines included reactivity and JSX. Or if browsers included an API similar to jQuery. Quick math to grasp the scale: 100kb * 1 billion users = 100TB of data that needs to be transferred and parsed many times, every single day. It's absurd.