Out of that list, OS and browser itself are the only one that couldn't be done in the browser in theory. Yes, even robot assisted surgery systems, although that

Out of that list, OS and browser itself are the only one that couldn't be done in the browser in theory. Yes, even robot assisted surgery systems, although that kind of disturbs me a little too. You could just do the GUI in the browser and the actual hardware control in a real time scheduled process. But even then, what's stopping some sort of WASM real time scheduling type extension from being created? The rest are gradually moving towards the browser as performance issues get fixed, e.g., WebGPU, WASM, etc. It's going to take time but the incentives still strong to gradually try moving whatever can be put in the browser in the browser, and to keep creating more web extensions to enable any remaining roadblocks. In the long run, the OS under the browser, the browser itself, and real time/embedded type code that runs on hardware too constrained or critical, are the only things safe from being swallowed up by the browser's world. The modern browser platform is like what POSIX or the JRE were meant to be, except it actually worked.