Actually, in most cases you can't even have gold derivatives long term because they typically expire after a certain period of time. Here I refer to gold futures as well as options and likely gold ETFs too, though I'm not sure about the latter. With futures, for example, you can of course roll over the contracts for the next month, but you will have to pay a price difference which is about a few percent, so-called contango. This may not look like a big deal at first, but in real life you will be losing constantly, each month. It is like house edge in gambling if you know what I mean. This is not so much about playing against experienced professionals with deep pockets as playing against the system itself.
For long-term play, there are gold ETFs, and also gold accounts in state-owned banks (such as China offers its citizens.)
The latter are really a minor form of gold standard (except that state-issued claims on gold are denominated in weight rather than currency units.) The history of all gold standards is that they collapse as the authorities run out of the physical stuff to redeem paper claims. And gold ETFs don't even have the state behind them!