First: Traditional Chinese Medicine did not stop developing at the end of the Qing Dynast
At its core Traditional Chinese Medicine stopped developing 2000 years ago which is the era of Huangdi Neijing and Shanghanlun and even when Huangdineijing talks about the ancient people(before that era) it looks like they had already lost the ability or knowledge of those guys. In the last 2000 years most of the books in TCM have been about explaining these old books and very few major movements like the wenbing stuff have happened since then which are also based on the old stuff rather than changing anything major.
Training in Traditional Chinese Medicine since the 1920's has incorporated learning Western anatomical knowledge as well as physiology.
Yes but the two systems have not been merged properly. Try explaining how TCM connects sixiang wuxing to explain everything in the human body to the environment as well as the universe or sanhun qipo or the spirit stuff in the qianjinyifang to a modern scientist who asks for scientific evidence and see for yourself if the systems have been merged well.
At this stage most people who have been to TCM school know some western medicine and as much as it can help to know the advantage as well as the weakness of TCM in the treatment of each specific case, the extra information has very little effect on how a properly trained TCM practitioner can diagnose and treat the illness using TCM. TCM is complicated and it is impossible to directly connect the western diagnosis and TCM diagnosis together based on the symptoms. What is low thymus function in western medicine can be different things in TCM.
Which brings me to another point - TCM practitioners like to claim that they are treating the root of the problem , when in fact for the most part TCM is directed mostly at treating the symptoms of disease.
I agree with this point and I believe it is the result of very poor TCM training in the modern TCM schools(including those you mentioned) and merging TCM with western medicine in an improper way.
Both TCM and western medicine are ideally about treating the root not just the symptoms although they have different theories for explaining the root, however whether a practitioner of either types of medicine is able to do that depends on his knowledge about his field as well as the physical limitations of the diagnosis or treatment instruments/methods.