When an assignment is copied for convenience, I may want to post it for one class and not the other. It is super annoying that when I make a post--choose the classes I want to copy it to, and choose "unpublish" for the original it still gets gets published for all other classes. Just like how when you are copying an assignments and you are prompted to fill out corresponding folder placement, due date/points awarded etc, you should be able to choose whether it gets posted/published for that class or not.
Also, Schoology should look into scheduled publishing for assignments like that of Google Classroom. This would really help if a teacher is planning ahead to be absent or is just extremely organized and would like to set the week up in advance.