Currency devaluation
Gold ingots purchased can easily be exchanged for other stronger currencies, as gold is accepted and traded all around the world.
Economic and/or financial crisis
In the event of economic and / or financial crises, the price of gold generally rises and this protects the owner of ther ingots.
Bank default
Since they are not tied to any bank, there is no risk of losing the funds held at the failed bank.
Political instability
Physical gold is a movable asset and can be transported elsewhere without undue effort, in case the situation requires it.
Fungibility
Gold, as a fungible good, is the property of the possessor (like any banknote). In other words “good faith possession means title”.