One of the most useful features (IMHO) of any PDF editor is the ability to delete and insert pages from a PDF document. The page export feature (leaving original document unchanged) is also very useful, but one can get by with copying the original document and then deleting all unwanted pages to finally leave the "exported" selection.
I know there are web-sites offering such editing features, but I am unwilling to upload personal or sensitive documents to a third party site to achieve such a simple task. The current Adobe route to providing this simple task is a monthly fee which is unjustified.
I recognise that some PDF document structures will probably not permit such an operation, but when it is possible, I am sure that this tool would be very popular.
I have looked in the New Idea section for a mention of this type of tool, and failed to find it. If it's already been suggested, then please accept my apologies.