I wouldn't mind that it was deleted, but all the "associated" information in that was invite isn't transferred to the actual appointment or event. IF all the information was /is transferred then it would make sense to delete.
AND... yes Outlook ... transfers all the related data to the appointment /event, so that you still have it.
So if the point is to match Outlook's processes... then this is not doing that.
For instance, if I am invited to a meeting using Outlook, and there is a document, telephone and an agenda in the meeting invite; I accept the invite; on the actual scheduled meeting is the document and telephone. Not true if I am using Smartermail.