CBT and neuro-transmitter based pain killers are the dominate treatment options because they are CHEAP. Governments and corporations are not choosing greedy options (addictive drugs that keep you sick), that's nonsense. They are choosing the cheapest options simply due to cost. Public biomedical R&D isn't taken seriously at all. Things like stem cells, tissue engineering research is insanely expensive. It's so much easier for pallative treatments to become an industry of their own simply due to economics.