I suspect the directors and writers were trying to decide whether to "re-introduce" Dr. Pulaski with a softened image in the next season or just bring Crusher back, and they chose the latter because it was easier. The problem with Pulaski was that although she was convincing when it came to doctor heroics, they didn't seem to have much in mind for non-doctor Pulaski and her relations with crew members. And I blame them rather than the actress. This opposed to Crusher who came off as very personable and added the mom factor as well. She brought balance to the show somehow.