There are at least two related reasons for this.
First, there is the fact that a person’s health is not based only on physical factors and on factors that are easily understood by science. Instead, a person’s health is also influenced by their emotional and psychological states. What this means is that a person has to feel confident in the treatment that he or she is getting. Of course, it is important to take into account scientific evidence because that is the best way to know what a patient needs. However, it is also important to take the wishes of the patient into account so that the patient will feel confident in their treatment and will feel that they are likely to get better.
Second, there is the need for the patient to be on good terms with their doctor. If a patient does not trust a doctor, it will be hard for the patient to get good care. The patient will not be forthcoming with the doctor. The patient will not always be likely to do what the doctor says. If the doctor takes into account the patient’s desires, they are more likely to have a good relationship and the patient is more likely to have good outcomes.