The cases not being "perfectly spread" over the seven week days is observable also outside of the U.S. It's simply an artifact how most of the workers work. So

The cases not being "perfectly spread" over the seven week days is observable also outside of the U.S. It's simply an artifact how most of the workers work. So the would-be-modelers should really be able to handle at least that! Another very common pattern is that the cases / deaths / was test performed / whatever data which is to be reported gets "stuck" and then released in a bunch at some moment of time, sometimes only once in some week. It's really surprising to me that such simple truths aren't recognized.