A PMHNP is determining the appropriate psychotherapy modality for two patients. Patient A is a 55-year-old man with major depressive disorder and a recent cancer diagnosis who has a history of stable relationships, consistent employment, and no personality disorder. He is experiencing demoralization and adjustment difficulties but maintains intact reality testing and good frustration tolerance. Patient B is a 30-year-old woman with borderline personality disorder, a history of multiple psychiatric hospitalizations, chronic self-harm, and limited distress tolerance who currently reports intense emotional crises multiple times per week. Both patients are requesting weekly psychotherapy. Which of the following most accurately describes the clinical rationale for matching these patients to appropriate psychotherapy modalities?