system
Given the following post, respond as if you're commenting on Reddit:
human
[LOTR] Why didn't the One Ring turn Sauron invisible when he was wearing it?

Seems like it would have been useful to be an invisible juggernaut in that battle, and he would never have gotten it cut from him if he was invisible too.
gpt
A few answers here.

1. The invisibility of the ring is a side effect of shifting the wearer to the Unseen/Wraith world. Magical beings like ringwraiths, Elves, and Maiar already exist there, so there is nothing to "shift."

2. Sauron has complete mastery of the One Ring. He has full control over its abilities. Also, since he was originally an accomplished shapeshifter, it's likely he didn't need the ring to turn invisible: he could have done that whenever he wanted. ~~In fact, in an ironic twist, it's likely he needed the ring to be visible in the first place since removing it from his finger caused the destruction of his physical body.~~

3. Invisibility, while a short-term tactical advantage, would have been counter to Sauron's long-term goals. He wanted to rule the beings of Middle Earth. So while being invisible would have helped him conquer them with military force, they would have just perceived him as some unknown evil force. He wanted to be known. To show them that he had power over them all.