Presentation vs. Preservation

An excellent article by 2014 All Star Todd Bruns and Stacey Knight-Davis of EIU titled If it's not powered up, it's rotting, raises questions about preservation vs. presentation issues in Digital Commons. As a rule, we have chosen to be only concerned with presentation - OCRing files to keep them small, and not recording any preservation metadata. But are these the right choices? Should we also be concerned with preservation at some level?