Superfluous

With a full rain suit, carrying an umbrella may be superfluous.

Then I began to play in timid fashion, venturing only twenty or thirty gulden at a time. Meanwhile, I observed and took notes. It seemed to me that calculation was superfluous, and by no means possessed of the importance which certain other players attached to it, even though they sat with ruled papers in their hands, whereon they set down the coups, calculated the chances, reckoned, staked, and—lost exactly as we more simple mortals did who played without any reckoning at all.