Sorry, I was not specific enough. It's a "silly notch" to people who don't use an iPhone with the notch. If you never upgrade, it will remain a silly notch to you forever, while those who do upgrade find that it disappears completely and immediately, as I said.

If you want to watch landscape video, a double tap switches between notched and non-notched views, so you can choose if you care. Most people don't after day one.