In an ideal world, where medical care is given with honesty and integrity by practitioners who are well-trained and keep their skills and education current and evidence-based, when complications or disappointing results occur, patients will have been prepared for that possibility.
Sometimes, however some part of that recipe is missing, and expectations and reality aren’t matched, and so the doctor-patient relationship starts to fray.
In these circumstances, an honest, impartial opinion may be all that is needed for a patient to be reassured and continue with their doctor to address whatever is needed.