
Migrating content out of one blogging or content management system into another is one of those tasks that doesn’t usually merit writing a feature-complete, polished migration tool; no two systems are alike, and no two migration scenarios are alike either. Since it’s an infrequent process, there’s not really incentive for anyone to write or maintain a dedicated Drupal module for doing such migrations (unless perhaps they find themselves doing a whole lot of migrations for clients.)