I decided not to do OMS because it wasn't for me. I did a lot of shadowing at my DS department, took the CBSE, and did externships. My impression was that the procedures that were most critical were the removal of teeth/pus, biopsy, implant placement in the edentulous, and trauma. However, I was disappointed that the bigger OR cases were often elective and had questionable therapeutic value. I couldn't see myself performing those big cases on patients because of the risk associated with surgery, and the healing that is necessary, VS the questionable therapeutic benefit.
To contrast, I can easily see how a cardiac surgeon justifies TAVR, but the issues that most OS treat are not age related and don't involve organs like the heart. The case volume for life saving/extending surgery just isn't there in OMS unless you go the path less traveled, and less available, like a cancer academic career. To me the 4-6 years of extra training didn't justify itself. I am happy with my career decision and do a lot of tooth removal and implant placement in my general practice. This is a bigger discussion, but I think there is a movement in healthcare towards doing what you're competent in rather than what "turf" your specialty claims. That's especially true in dentistry because we're in an outpatient environment.