Isn't seeking a second opinion something you usually do when the first opinion sounds fishy, doesn't seem to match the evidence, or when the doctor giving doesn

Isn't seeking a second opinion something you usually do when the first opinion sounds fishy, doesn't seem to match the evidence, or when the doctor giving doesn't seem to be doing his job seriously (e.g. dismissive, preoccupied etc)? Or in cases where it is known to be a difficult situation which makes you think multiple diagnoses are needed?