Question on Page Reference and Screen Type Variables

I'm working on a storyline project with a pre-made template, and there are two variables in each slide that I want to understand better. One is "pageRef" and it sets to the name of the layer shown when the timeline starts, and the other is "screenType", which sets to "basic" or "video" depending on the type of slide. My question is why are these variables in the project? I'm confused how this adds any functionality to the course and seems redundant. What am I missing?

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