Bottomline is that you're not free to use what you want in the browser, that's what drove the popularity of JS (and JSON). If you think that XML was a popular c

Bottomline is that you're not free to use what you want in the browser, that's what drove the popularity of JS (and JSON). If you think that XML was a popular choice, but then lost its popularity due to JSON having better syntax - that's not how it happened. JSON is easier to use, that's why it displaced XML in browsers. But if there was native or close to native (WebAssembly?) support of things like XSLT/XQuery 3.0 and XForms 2.0, then I would switch away from JS and its framework zoo in a heartbeat. > deep mismatches between JSON and XML not between JSON and XML, google "X/O Impedance Mismatch"