True, I have an example right at my left hand in this book I'm reading:

"....an established Rule, which is receiv'd as such to this very day, that nothing is capable of being well set to Musick that is not Nonsense. This Maxim was no sooner receiv'd, but we immediately fell to translating the Italian operas; and as there was no great Danger of hurting the Sense of those extraordinary Pieces, our Authors would often make Words of their own, entirely foreign to the Meaning of the Passage that they pretended to translate."

_ ADDISON, IN THE SPECTATOR ( 1711)

They were on to something, logic maybe? As I see no reason why some nouns are and others are not capitalized.