> can be trivially changed if certain people decide that it should

This is simply not the case - see 2017 bitcoin cash fork or Segwit2X push. At the end of the day money is a human invention, meant to facilitate value exchange between humans. So it requires consensus between the users of the money, if some fraction want to change the rules they are free to.

We went for something we found in nature with properties that were pretty good for that, but with some downsides (not absolutely scarce, difficult to transport, easy to steal) to something created specifically for the purpose.

It can be trivially changed in the sense that it's a computer program that simulates money. No amount of consensus can increase the gold supply.

Technological advances can increase the gold supply. Asteroid mining, extracting it from sea water, mining lower quality deposits, etc.

There still has to be consensus on using gold as money, if there isn't it will lose its monetary premium to something that has better monetary properties.

> There still has to be consensus on using gold as money

This is a great point. The choice to value gold as currency over other rare metals is 'a cultural property of the community' and yet not 'trivial' to change, just as Bitcoin's consensus isn't.

You can't "prove" that Earth's gold supply won't increase with asteroid mining either. We can disagree on the relative difficulty of asteroid mining vs. changing Bitcoin's consensus rules, but you must at least concede that they are both possible.

Right... No matter how many people wish it to be so, the amount of gold on the planet cannot be arbitrarily increased, instead, you'd have to go to extremes likes mining astroids in space, a feat of engineering that is only possible in theory.

Mining asteroids is quite possible in practice. In fact we've already taken material from asteroids and returned it to Earth. The only question is how long it will take for the technology to advance enough for profitability; there are no fundamental issues preventing it. It really seems inevitable assuming no civilization-ending disasters. And it can increase Earth's gold supply arbitrarily up to many times the current supply. And it only takes one company to do it. Anyway, if our only disagreement is on the relative feasibility of changing Bitcoin consensus vs. asteroid mining, I'm happy to continue to disagree with you on that.