Session Evaluation

As Mainframe customers are creating third copies, untouchable copies or offload Data to the cloud is it still relevant to know what is going on, on your Tapes and Disks?
Or contrarily you must make sure you are capable of reporting on these devices because of regulations? Tape and disk space becomes cheaper and cheaper. Why should you still be capable of mapping the usage to applications, business units or even users? I would like to get your opinion and experience on this topic and share with you, what we learned from our customers.