Canon is now offering to de-click your RF lens control rings for 80 bucks. What they’re referring to as the “Clicking Sound Modification Service” allows a user to send in their lens to have the click either removed or added back in.
The click of the control ring, canon says, “allows the user to have a sense of how much it is being turned”. But it isn’t always useful. If you’re shooting video, for example, the sound of that control ring may be recorded in your footage.