If you can get away with storing your data in the DOM, then go ahead. But this technique is mostly applicable to low-interactivity views (see the view layer overview chapter) - once you start displaying the same data in multiple locations, having your data tied to the DOM structure and state goes from being a easy technique to a complication. Hence I don't really consider storing data in the DOM as a single page app technique as much as an easy way to do low-end interactive components.
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If you can get away with storing your data in the DOM, then go ahead. But this technique is mostly applicable to low-interactivity views (see the view layer overview chapter) - once you start displaying the same data in multiple locations, having your data tied to the DOM structure and state goes from being a easy technique to a complication. Hence I don't really consider storing data in the DOM as a single page app technique as much as an easy way to do low-end interactive components.