There are a few previous discussions on the site already regarding this topic. This previous reply gives some details - Nasal polyp
In short, yes, it is absolutely critical to resolve the deepest underlying factors involved with the development of polyps and this is something that Chinese Medicine can help with. Resolving polyps that are there already is not impossible, but is difficult and at times surgery may be warranted.
Generally you are correct in that there is extremely high levels of recurrence, so either way you end of having to deal with the deeper problems. While these will vary from person to person, certainly within Chinese Medicine viewpoints, they involve the immune system and the digestive systems (generally what we call the lung and the spleen systems - see “my lungs are what” and “my spleen is what” for general information).
Generally speaking you are looking at 2-5 months of treatment initially and then possibly more after that depending on underlying health issues, etc. So you would want to allow for at least 8-15 visits before you will likely be able to see an affect on the polyps themselves.
In this case study the patient had had 4 previous surgeries but the polyps kept returning, with acupuncture and Chinese herbal medicine he hadn’t had a recurrence in many years and many related symptoms were improved.
My experiences clinically have been similar to the above presented case with many of our patients going decades after treatment and never again seeing a recurrence.