While almost every CAD software doesn't allow for backward compatibility in CAD files, It would be nice for those who utilize subscription licensing to be able to have that luxury. Most companies disable backward compatibility to ensure companies stay current with maintenance, generating a consistent revenue stream. This has caused issues for companies that have many smaller projects which work with many different clients/customers where a certain version of Creo (not necessarily the latest) must be used.
This would be a MAJOR help to organizations like mine in which versions of Creo are dictated by project needs, not always a central IT/company dictate.
This would also be a great reward/incentive for people to move to subscription licensing.