The idea of chattily streaming UI changes over the network doesn't work out for mobile web, where networks are frequently unreliable if not totally inaccessible.
Or you are referring to Web Apps that work offline?
Many native mobile apps have these properties, and if mobile web apps want to compete they will have to as well.
In practice, that means generally minimizing network traffic, being smart about caching data, and providing soft failure modes.
Neither Liveview nor StimulusReflex are well suited to this problem space.