If videos had to match the field of vision, and this was the audience's primary concern, I'd 100% agree! I think it's close to their primary concern when watching something like a nature documentary or a historical drama or playing a video game where you walk around a landscape. Vertical video has convinced me that you can tell some kinds of stories and convey certain kinds of info without using deliberate backgrounds, people standing next to each other talking, and people moving around. In vertical video you see a lot of cutting between two people, people talking about being in an environment that does not match their background, or one person playing multiple people. You don't need to learn pesky blocking or how to act with your body. Things that used to seem static, like giving a lecture while standing still, can seem reasonably dynamic. You can just focus on the human face. It's an option with pros and cons and it will encourage certain kinds of uses