This is what I picked up a while ago regarding scene modes: Someone has set a few settings based on various outcomes the settings never change but your view will. So each mode will set your camera into various pre defined settings. This is pointless as not each landscape, sport or other mode will have the same lighting time after time.
But it does come in handy when learning, as it did teach me that these settings are average and if you switch to manual you can still set them the same way but have far more control over them. They also teach you what settings fit what scene.
If you look out your window you will see a framed picture that picture will never be the same every day.

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