Because others have presented use-cases and you present inane counter arguments. Even in other countries movie watching is going strong (you know, as evidenced by the fact that foreign box office revenue does better than domestic many times if not almost always) and has been pointed out 2016 was a record year for Hollywood. The fact that every cinema chain (at least in the US) posts warnings about small screens suggests that it is a problem. If you don't go to cinemas then you don't really have the authority to have an opinion on whether it is annoying. If you do go to the cinema and don't find it annoying then good for you - clearly many others do. While Theatres may be the direct use case for the feature, as you've agreed, there are others.