I know plenty of people that don't own a TV or a monitor, they only own a phone and they have a locked to portrait mode. I wouldn't be surprised if you checked the world and there were more of those people than TV owners at this point. Why should they have to make their videos for TV users?
Point-by-point: phones can (should be able to) unlock from portrait for video.
As I said, video is generally better in landscape, so it's not really about TVs, TVs are landscape because viewing video is better in landscape.
Why anyone has to even argue this OBVIOUS point just demonstrates the militant ridiculousness of people that get on the defensive because they often (not always) put no thought into their video compositions. Vertical video look stupid, get over it.
