Whereas with bitcoin, it is fairly unmoored from physical constraints.
There is no natural price for bitcoin.
It could go up forever or drop to nothing and both are acceptable valuations that would be hard to question -- because it is merely shared belief.
People should know more about the paper gold market. Most importantly how much gold people think they have stored safely in vaults, but is essentially just an IOU that could never be paid if everyone withdrew at the same time. Pretty scary/exciting stuff. I couldn't even begin to describe all the dimensions to this and still learning myself. But long story short, consider the possibility that the price of gold isn't anywhere near tied to a physical thing. :)
All money, currency and assets are based on faith on the continuing demand for that thing. All the other properties are incidental.