Placebo's are not suitable for all cases. However, they are suitable for some. They are even the best for some.
You can't treat cancer with placebos. You can treat the side effects of chemo with placebos (to some extent).
You can cure many types of headaches, migraines, concentration disorders and many other things with placebos. If the placebo is selected properly the side effects are minimal. If the placebo is presented properly the nocebo effects are minimal.
Some doctors do use placebos, because they are sometimes the best way to go. A low density vitamin C tablet from the pharmacy can cure a lot more than vitamin C deficiency. Especially if it is not covered by insurance. Especially if it is expensive.
There is, however, a stigma to it because the most effective method requires lying to your patient. Even if that is the best way to cure them it feels iffy to any half decent doctor.
There is value in homeopathic stuff: it is expensive and does no harm (except to the wallet).
I wish I could go back to believing in it because that would help me in some areas. Alas, that ship has sailed.