We’ve optimized our efforts on treating symptoms and not causes. Drugs that survive regulatory scrutiny and are profitable tend to be those that treat symptoms of chronic illnesses. If you can prove that someone’s LDL goes down and they will buy it for the rest of their life, that’s a drug that will survive. They don’t have a miracle cure for this because they are withholding anything, there is just no incentive to research it and if there was, there is no good way to prove that drug X will cure non-visible condition Y without good, measurable data.
I also think people naturally tend towards easy and fast solutions even if those solutions are known not to work. This self imposed blissful ignorance is what causes people to keep buying weight loss supplements or go on diets even though both are known not to work while we know that for 99% of people there is a simple solution -- reduce stress, learn to like to eat healthy and exercise daily.
Realistically this is what most people want. I spent years watching people choose to go on medications rather than make simple lifestyle choices. Habits are powerful.
It’s not possible to treat the cause when a patient wants the easiest solution. So yea, we have a bunch of medication‘s that treat symptoms. Causes are sometimes impossible to know, the body is complex enough that we don’t even understand how some medications work at all.
But that is not true.
The problem with statement "depression is lack of serotonin" is the same as with "being overweight is due to eating too much". It is factually true, seems like an easy solution and yet is mired with lots of problems.
The problem with medication is that it treats the symptom (lack of serotonin) rather than the underlying problem (how did we get there in the first place?) Kinda like telling somebody to loose weight by restricting their diet before first understanding what caused them to gain fat in the first place. Is your diet composed of garbage? Why is it, is it because you can only cook garbage? Is it because you can't cook and only buy garbage? Is it because you sit whole day and don't exercise? Is it because you are getting depressed and make it up with food?
The treatment should address the causes of the problem and not just the symptom.