This is really easy to understand from first principles. If the total value of the world increases and there is only a fixed amount of either gold or bitcoin, or any finite thing to represent it, it's obvious that whoever has that asset today has to do nothing for it to grow. Just sit on it indefinitely and people will give you more value for the same amount.
On the other hand if the value of the world is represented in USD and the feds keep print more money, you can’t just sit on the money you have today and expect it to be worth more. You have to put it back in the value creation system for it to grow in value.
Bitcoin and gold suck at representing value. Fiat currency is much better because you can print more money to keep up with the world's total value.