I think it's used to show that Bitcoin itself doesn't change, rather other currencies and assets changes against it. Let me try and use an analogy here;
Think of it like a world class resort located in a remote area or a really precious stone which few know about. Most people are not aware of them or their worth and as such it doesn't really have a value cause there's no market at the time.
After a while scientific research could be done on the stone or more potential buyers discover the resort and realize it's a modern building regardless of the location, their market audience starts to grow and so does the market value, but there always was the intrinsic value even when no one was paying attention.