[cpill]

since when is HTML lighter than JSON?! this use case was what propelled JSON into the mainstream.

[kawsper]

The argument is that it is lighter for the device just to receive static HTML, than it is for the device to receive JSON and build HTML templates.

[ymolodtsov]

The idea is that HTML is just slightly heavier but the advantage is you can render it on the server and don't need all that middleware and serialization layer.