>Yes, I'll grant that gold is stable in that it doesn't corroded , it's somewhat rare, etc, so it is better suited than other metals, there's still no intrinsic reason to value it though.

...you just provided intrinsic reasons for why gold has value. Humans need to trade, bartering goods and services directly is less efficient than using a currency, and gold has qualities that make it more useful as a currency than other materials. It is the opposite of an arbitrary metal, it is a material that has specific desirable qualities hence chosen to be used as a currency by many societies.