Most people watch the videos in portrait mode though. You don't hold your phone lying down. Does tictoc, instagram even work in landscape moded? Youtube shorts are formatted for portrait. So, why would they film in landscape? They are not filming for your LG OLED or even youtube. Boomer.
I filmed 12-15 seconds of No Leaf Clover this Sunday for Insta Stories. Landscape would be pointless for that.
And,
I hate to see a sea of iphones at every show. But at the same time I know many moments that have been saved to be seen by fans and saved for history because of people filming. So for me, it's a double edged sword. The best would be if everyone got together and dedicated one person to film, so moments like this would not be lost to time: