There is a reason to be able to purge old files. As required by law, those files must be maintained for 7 years. When, I bought my practice from a retiring dentist, he requested, as part of the sell, that I would only maintain those records for 7 years and then have them destroyed.
There is no reason for me to maintain his files past that date, and they become a liability for me to keep them in my possession. As one of your users this is something that I recommenced you put as one of your top priorities.