It would be wonderful to have a way to customize the update request emails so that the end-user that's making the update does NOT have the option to get a copy of their responses/receive a confirmation email that contains the link of the sheet.
Why have this feature? So that it's possible to allow teams to send external parties an update request and not have the risk of the external party getting access to their sheet, or even seeing the link to the sheet because it's un-necessary and confusing to the external party that has nothing to do with the sheet.