It really comes down to material specifications, just about every manufacturing process (in most countries) have established "acceptable standards". There are many and governmental/private trade groups, these standards are what one needs to learn, to know "is it worth it?", (maybe or maybe not). Devices that have "Mil-Spec's" in general are worth it, as there are many mil-spec's that just deal with Gold Plating.

Even the scrap industry has standard specifications!