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Some films were recorded with a lower frame rate due to some reason. As for variable and standstill, I think this would only be needed when investigating a recording in detail. Not sure if they really need it. Perhaps they just want it to cover more use cases.

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"due to some reason."

Money. A lot of silent movies were filmed around 16-18 to save on film costs. Also sometimes they'd crank it up or down for dramatic or comedic effect so a film could have a variable frame rate.

Then along came sound with the audio track printed on the side of the film and they had to bump up the basic frame rate to 24 (or 23.9something) which was the lowest they could go without it sounding bad.

From what I gather, projecting preserves the viewing experience which is part of the film's value, not just the image. Plus, sound extraction and timing sync can be simpler with a projector. Scanners capture detail but might miss some nuances that make film unique.

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