It's actually not. Check out the example below:
The top image is the original one I posted earlier. The bottom image is using a screen capture of a video I was playing back on my phone.
Keep in mind that this is for 16:9 video, which is the aspect ratio that the iPhone captures, as well as all of the HD television standards. If you happened to see thinner bars on the side, then my guess is that you were watching a movie that had a wider aspect ratio (there are a handful of different film aspect ratios, including 16:9). With a wider ratio you would see thinner bars on the side, however you probably didn't notice that there were now thicker bars on the top and bottom.
I would have provided visual evidence of that, but I've just learned that iOS doesn't allow you to screen capture copyrighted material during playback.
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You can't really declare that unless you provide a better alternative. In the case of the bump, the alternative was likely just making the rest of the casing thicker to match. As someone who didn't use to put my phone in a case, I probably would have preferred that. However, for the notch, what is your alternative?
How, if the technology doesn't allow for it?
Key word highlighted. That's pure speculation on your part without any evidence to substantiate it. I realize that's what we do on these type of forums, but you can't just arbitrarily say it seems like something should have happened "just because."