The probem here isn't that gold or silver isnt a good asset and if its about track record gold has been a very good option for a very long time even longer than bitcoin, but where you are getting it wrong is thinking of diversifying, the question you should ask yourself is can I afford to build a good stash in both asset, then if not you should focus one building up your stash in bitcoin and when it's has gotten to at least a year of your living expense then you can consider diversification.
The problem with early diversification is that you would end up having little of so many asset neglecting the law of concentration which means you gain wealth from building one asset and maintain it from diversifying, so diversification is not a good option for someone trying to build wealth.
It's true, building wealth won't come quickly, it takes time and a process to get there. I think whatever type we will invest. However, when something easier and quicker comes along, I think why should I use another option. Yes, BTC really provides an opportunity to go there as an investment tool, whether you want to invest at the same time or use the DCA purchase method as many people are currently implementing.