Given this, the story that collecting potentially useful materials is an evolved instinct makes a lot more sense than your story. Some of us have it more than others; I find it really hard to resist picking up something that looks like it might be useful and taking it with me. It comes from a place deeper than my conscious appreciation of beauty. Feels like pure instinct.
If your story is true, then you would expect the trait of collecting useless bling to have died out a long time ago, or at least not be as prevalent as it is today.
And by the way, you could extend my story to not just being about collecting lots of physical things, but also seemingly useless information and skills. Rare knowledge and rare abilities aren't a huge leap from rare physical resources.
Sure it does. The explanatory power is that not all human traits have a strong impact on evolutionary fitness, either on the individual level, or on the social level.
Unless conclusively demonstrated otherwise (which a story composed post-facto is not), this is all meaningless noise.
The first thing about knowing something is being clear about the limitations of that knowledge. Just-so stories have no such limitation, which is why they come up so often as unfalsifiable nonsense. They can explain everything and anything, and therefore, explain nothing. All they are is a vehicle for repeating the biases of the storyteller.
This is a beautiful story, but I can draft an equally beautiful, completely contradictory[1] story about how prehistoric individuals that wasted time collecting cool but useless rocks were less likely to have just the right thing for surprise challenges, because they directed their efforts towards hoarding useless bling. [2]
Here's my explanation - and bear with me, here.
Some people collect weird things.
That trait sometimes does, and sometimes does not result in an evolutionary or cultural advantage.
Making definitive statements about where this set of weird things falls on the spectrum above is just blindly guessing in the dark.
[1] Which is why beautiful, hand-wavy stories that explain the behaviour of people tens of thousands of years dead are largely useless for understanding that behaviour.
[2] If I were given the choice between asking for help dealing with a surprise challenge, and my options were two people, one of whom I know collects Funko Pops, and the other one does not, knowing nothing else about those individuals, I'm not going to bias my selection towards the former.