Coinbase has a focus on trading. However, you can use bitcoin to buy things through Coinbase Commerce.
The idea that gold is useful as a store of value is ridiculous. You have painted the picture perfectly with your comment. It is not easily moved. It is not easily utilized. It is worthless to the average person and it’s price is heavily inflated.
After all, the eponymous scheme by Charles Ponzi was built on legitimate postal reply coupons.
So a list of non-monetary uses for gold is not evidence that its monetary uses are not Ponzis.
Most financial instruments are at least Ponzi-adjacent in that their value is derived from the expectation that other market participants will pay more for them than you did.
Whether it's real estate or equities, precious metals or cryptocurrency, profit requires an infinite cycle of growth that must collapse at some point.
Go to Coinbase and try to figure out how to use Bitcoin to buy something with. All they talk about is Bitcoin as an investment.
A currency can’t be an investment as the expectation that it will rise in value undermines the main quality of a currency, which is to maintain a stable value, so it can be used as intermediary.