Yes I'm referring to mobile web apps that either work offline, or don't severely impact their UX in the presence of a slow or unreliable network.

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.