Many imported or exported file formats are either too old versions or formats that have become infrequently used. Sometimes the limitations when importing a file are too important. See for example the handling of Adobe AI and PSD formats. There are even limitations between native Corel software formats. I think it's important to update all of this so that users of the suite can work without difficulty in one format or another while limiting constraints as much as possible.
This is critical for my work. My clients use different products and I need to be able to load and export to those formats. Importing Illustrator's AI format specifically is unusuable.
Nice suggestion. Especially CorelDRAW needs to import PDF's correctly. I can put import filter for PDF file format top on the list.