For something like a slideshow, I think you could have it both ways - default to a scroll view that shows all of the slides at once, and make it so clicking a slide shows the slide on a single page that is deep-linkable. The user could then navigate forward and backward between each individual slide page if they so desire.

I suppose it's all a matter of trying to do what will best match user expectations. Or just whatever will make them happiest. Maybe call it the principle of least annoyance.

Of course, if you make an ad supported slideshow app, maybe you want to show one slide per page to get more ad impressions. I suppose that would be the principle of maximum revenue, along with its corollary (from the user's perspective): the principle of maximum indignation.