Why put salt in cowboy coffee?

Could you explain the purpose behind adding salt to cowboy coffee? Is it for flavor enhancement, to draw out specific notes in the beans, or does it serve some other purpose entirely? Is this a traditional practice, or is it a more modern addition to the brewing process? Additionally, does the type of salt used matter, and if so, why? Lastly, are there any potential drawbacks or considerations to keep in mind when incorporating salt into cowboy coffee?