Yes, we also need "only one", except in my country it's basically impossible to go a few kilometers from any spot without hitting a settlement (and if you can do that, your point of origin was probably inside a protected national park). That's probably why we still don't have a storage place despite even having reasonable (even if not perfect) geology for it.
Storage is not not purely theoretical!! In fact there are <lists five completely theoretical storage methods that rely on stable climate or perfect geography>.
It's not, storage is mostly a logistical and political problem. Logistical in the sense that the storage needs to be secure on timelines longer than a few generations. Political in the sense that no one wants it in their back yard.
It's not crude "nobody needs". It's just storage being too expensive to expand infinitely. If it weren't, it'd be a great opportunity to stock up, because the need will be there for decades.
Sure, but a realistic possibility of a future need for the item is already a pretty strong reason. There are a great many items in America's basements and self-storage units that don't even have that.
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