I'm not convinced it's the right move for the web to try to accommodate the development of every conceivable kind of GUI application. This doesn't change when

I'm not convinced it's the right move for the web to try to accommodate the development of every conceivable kind of GUI application. This doesn't change when someone makes a computer whose only GUI toolkit is a web browser. If you try to port Red Dead Redemption 2 to JavaScript, you're going to have a bad time. That's not the fault of the web, it's just not an appropriate choice of platform. Like I said in another comment in this thread, the downsides of the web as a platform wouldn't go away by improving its support for parallelism or for concurrency. Web-based UIs would still seem clunky and half-baked compared to native apps, and they'd still use far more computational resources than native apps.