How difficult would it be to create overview for sprints over all projects (or even in the same projects)? So you could be able to manage sprints in a normal way. Example close sprints from other projects that doesn't exist anymore. Or delete empty sprints? Doesn't seem like a rocket science especially when we are already flying to Mars.
I'm not quite sure what you are looking for with an "overview of sprints". Sprints don't make a huge amount of sense outside the context of their boards. Closing and deleting them is best done from their boards where you have all the information on them.
