In addition most traditional medicine is centered around use of whole herbs. Lots of times there's complex processing that goes into it, but it's still something you can often just... grow. Clinical trials are extremely expensive and with the incentive system we have right now it'd make 0 sense for a company to invest in proving that something you can grow in your backyard can help treat something
The WHO on the other hand has been investing heavily in traditional and complementary medicine (T&CM) in developing countries as they offer "care that is close to homes, accessible and affordable. It is also culturally acceptable and trusted by large numbers of people". Interestingly, the use and research into traditional medicine is actually increasing worldwide. The US seems to be pretty unique, even compared to developed nations, in how little it values TM. The WHO report linked below points out that 100 million Europeans, 76% of Singapore, and 86% of South Koreans commonly use TM. It also points out interesting research like:
> Another recent study indicates that patients whose general practitioner has additional complementary and alternative medicine training have lower health care costs and mortality rates than those who do not. Reduced costs were the outcome of fewer hospital stays and fewer prescription drugs (31)
Interestingly, they differentiate TM from CM. TM being a country's actual traditional medicine system and the knowledge passed down across many generations (e.g. Unani, Ayurveda, TCM, etc) and CM being more like "alternative medicine" that is not part of a country's traditional system (anthroposophic medicine, chiropractic, homeopathy, naturopathy, osteopathy, etc; think your aunt trying to sell you essential oils)
https://www.who.int/publications/i/item/9789241506096