I suppose the lube debate could rage for generations.
Technically there is an ideal lube for each part of a gun.
rails and slides would prefer a grease, the hand in a revolver would like a dry silicone, trigger parts a light oil ... each could further be subdivided into optimum requirements until you have a tool shed stuffed with 8 oz tubes and bottles of oils greases and metal treatments to make you feel better about your gun care.
Bear in mind folks, that the iconic Colt SAA and even further back to the old Kentucky rifle saw lots of service with not much more than lard, and still lived long enough to be seen today in museums. Ive seen a private collection consisting of several vintage black powder era pieces, each of which could, and occasionally were called upon to perform.

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it just needs more voltage