Why do we need such high density slow storage anyway? Would that lead to more energy-efficient systems, even if just due to space reduction? I mean, for regular

Why do we need such high density slow storage anyway? Would that lead to more energy-efficient systems, even if just due to space reduction? I mean, for regular data (video, music, images, text), we already have better resolutions than we can perceive (and going much further would be just mainly wasteful, and bottlenecks seem to be processing that data), and big services that host this kind of content, like youtube and others, well... can't be expected, on a long term, to not forget most of its content. So besides a few research applications... genuinely, is there any really important application that we have big trouble handling right now? I mean, the world storage requirements won't keep increasing forever, no?