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On one level never, so long as http is the dominant protocol.
For some things REST is appropriate, for other things.
I am impressed with websockets; it's easy to make a web page that controls your smart lights, stereo volumes and such where the updating is symmetrical: not only does clicking on the HTML button toggle the light, the web page changes when the light is toggled from a different switch.
With the right backend a business application could do the following: you are looking at a customer record that shows the order hasn't shipped yet, the page updates the instant the order is shipped instead of requiring a reload.
The other thing I would look at is web workers, service workers, and indexed storage. One scenario is:
you want to read the manuals for your favorite programming language on your computer disconnected from the net; a web app creates a Service Worker that downloads all the web pages as a brotli tar file (not ZIP for many reasons) and stores them in IndexedStorage on your browser: the Service Worker then acts like an http server integrated that serves the pages of the manual.
If you want to avoid the baggage of http you can also create a Web Worker and communicate with it with JSON messages, a little like having a local "websocket server".
Those tech have not been used much because the coding is tricky and the most popular framework so far is
https://developers.google.com/web/tools/workbox/
which really just complicates the cache behavior of the browser -- the probability that workbox will really speed up your app is about 0.01%, compared to something like the "solid compressed tar" approach which will have much better performance you can feel. (Like try the quarter mile in a Dodge Viper instead of a Honda Fit)