Yeah as Martin said, in the end it’s more about the eye than anything else. I remember a lesson from Bartek Skorupa where he plugged in dozens of nodes and math nodes and IOR values to get real life gold down to the scientific level, spent a lot of time on it, only to have it look as good as what you get with two or three nodes. He concluded it was a waste of time to approach shading and materials that way and advised everyone to not overcomplicate. Of course there is no right or wrong here, only preference.
