Well, we know how hard can be to store and hold gold. And if you let the "third party" do that for you, then you are at their mercy. One day they can just say "fuck-off" and not let you use your gold, I think we already have examples of that around the world. That can't happen with your Bitcoins, if you remember "12 words" you are the only one who has control over your funds.
I guess that "trust in gold" is dying slowly, it's like some "glory from the old days"... I am not into gold and I don't care about it at all, and I will say that new generations are more into digital things, and they know that "freedom" is not "freedom" if someone can control everything you do with your money, read banks and regulations.