I am an iPhone user who refuses to upgrade from my 7+ until this silly notch business is removed. It does not "disappear completely and immediately", especially when viewing landscape mode video content.
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.
I do not own a phone with a notch, but I’m under the impression that most video content is not wide enough for the notch to cut into the video.
I think you have the option of zooming in a bit to remove black bars on edges; with the drawback that corner pixels and the notch area are lost. Same as any other non-16:9 phone
I always thought I'd be bothered by a notch, but when my old phone eventually gave up the ghost I saw a great deal for a Huawei phone with a notch, and I immediately got used to the design. I expected to need at least a few days to acclimatize myself, but it was instant, weirdly enough. Now Now it never even enters my mind until I hear someone talking, or see comments, about notches in phones.