XML UI is all over the place. I'm working with some legacy code using JSF with some extensions and it's pretty much everything described here. There's a Java server involved so it doesn't work with saved pages (but it automatically takes care of any backend calls, so unless you want an offline-first app that can be a benefit actually). I'm pretty sure ASP.NET, or whatever Microsoft calls it these days, works very similarly.

The frontend pendulum keeps swinging back and forth between serverside rendering and clientside rendering so maybe in a few years we can reinvent ASP/JSF and call it revolutionary again.