Just as Bal said, it is just a perspective you can take.
We can use yin-yang, 5 elements, bagua or even higher methods.
Each has its own level of sophistication and depth to understand and treat people with it. An acupuncturist is meant to apply all known knowledge anyway which includes 5 elements even if it is not explicitly said so.
Some treatments are more effective using a 5 elemental practice, some are not as effective. so you have to see what works on what patient and condition. In my clinic i use all methods I can adopt, and change to what works for that specific patient.