Philosophically, all determination of "personal value" or "collective value" for anything is completely in the mind. Whether something valued collectively by humans is tangible or intangible, or intrinsic or not, is inconsequential. It's all based on shared belief.
False. In order for something to be a store of value, it's required to have some type of intrinsic value to humans that can't simply fall out of fashion at the drop of a hat. For instance, if one is trying to transfer generational wealth from grandparent to heirs over a 50 year timespan or so, the instrument you're using is required to still be needed on the other end of that timeline. You're not able to just make stupid gambles with such things.
There is no single bulletproof solution to this, so this is why people tend to hedge it out over the various best options that are not subject to decay or entropy for human-level timespans, or fashion, which are typically things like physical commodity currency (silver and gold), land, or some type of well-entrenched business. Something resembling an estate in other words. An estate - or store of value because they're highly related - cannot be built upon fashion, gimmicks, short lived trends, or artificial scarcity.
Just like antique copies of MAD magazine do not function as a store of value to humans even though they're pseudo-finite in nature just like bitcoin, bitcoin does not function as a store of value either because it's virtually the exact same dynamic as that example. Technically, it's possible you could get lucky and get away with using MAD magazines as a store of value and instrument to pass on generational wealth...over a short period of time, but in the long run, you're guaranteed to be shooting yourself in the face.
As for things like metals, the logic of my argument dictates that in an actual free market, the market cap of silver and gold would likely flip with one another, because the intrinsic value to humans of silver has vastly increased in recent times, while gold has not. To be the best store of value requires having the best real world use cases for humans while still having all other required traits of money like fungibility after all. We would use something like oil as money over both if possible due to this, but it's just not possible to do things like remove counterparty risk with oil, or portability and other issues, so metals are still king. The only question is if gold will remain king over silver or not.