While Drupal can handle many tasks like content management and user experiences, it is not well-suited for everything such as email, payments, analytics, video, and complex customer relationship management. Over the years, Drupal has evolved to more easily integrate third-party services through features like core fields, custom entities, and an entity API in Drupal 7, and in Drupal 8, it aims to serve as a central hub that connects to other applications and services.