I love that Canvas can bring over announcements when I copy content from another Canvas course. This keeps me from copying and pasting announcements I make every semester. To further develop this feature, it would be nice if Announcements were unpublished on import, meaning the instructor can see them but the students can't. With a "publish button on every announcement, instructors could release announcements quickly when they are needed without the tedious setting of a date and time on each announcement.
This feature would also bring announcements in line with other tools in Canvas that use publish and unpublish functionality and would help instructors who might unintentionally be releasing announcements to students from a past semester.