The gold standard was abandoned precisely because it was inferior. It was pretty useful up until early 20th century as a medium of exchange too. People used to use gold coins to buy things, didn't they?

Now it's not, and yet it's still valueable.

Honest question: in 20 years would you prefer to own a 21 milionth of bitcoin (1 bitcoin) or 21 milionth of gold (~8kgs of gold)?

Not thinking about the value of it, but of its future usefulness as value store and as mean of payment

Bitcoin 100%, because of the optionality and network effects.

I don't believe you can separate the value of Bitcoin and it's usefulness because the more valuable Bitcoin is, the more useful it becomes.

The more people who hold Bitcoin, the more scarce it becomes and therefore the more valuable it becomes. In 20 years, Bitcoin could go to 0, or become a widely used currency and skyrocket in value.

Once the number of Bitcoin holders reaches equilibrium then the value would remain stable, but we are definitely not at that point yet.

Gold value will never go to zero though

For the simple reason that it exist in the physical space and can't disappear, unless the laws that regulate our existence change, which is quite improbable

Gold will also work and retain a value even if society suddenly shuts down and reset to a "sticks and stones" state

Bitcoin advocates have this weird tendency to completely ignore decades of game theory

That's why people don't trust them