My essays aren't always discussed in the supervisions -- we often use the time to hammer out other ideas or problems or interesting things. The supervision does have to include some feedback for any work set, but that can be written as much as verbal, and doesn't have to be openly discussed (particularly if there is someone else there). If there are any problems occurring with the written feedback, you can always ask for clarification at the time or later.
Conversely, some supervisions have been entirely about the essay. And they tend to be the most boring, from my perspective, because more often than not it's been with a supervisor who seemingly can't be bothered to think of anything else to talk about.