I can agree with this, 'specially if we are talking about the body linking together to generate power via ankle, knee, hip, shoulder, elbow, wrist connection, or more specifically to a punch: Knee/Hip/Elbow. As you mentioned, the major thing that makes WC unique when compared to other arts is that this power generation method still fits with WC's ideas of facing & CL, as well as 2 hands operating as one/equal reach, efficiency and economy of motion (but I guess you can say the latter are pretty much covered in the first two
)
In regards to other's comments of footwork, sometimes it's necessary, sometimes it's not. But IMO, footwork is more of a necessity based on strategy/tactics more-so than a need to generate power when hitting. It helps in some cases, but most of the examples I can think of, the footwork is used to gain a better position while striking vs footwork being a
requirement to generate power when striking form a WC POV
.
One example I can think of from a technique POV could be when you need to use laap/da with footwork. Sure, the twisting & rotational forces of the body helps generate power, but I say you are laap'g because you have to clear an obstruction in order to land anything at all - not because you want to use the footwork to generate more power (but it helps). If the line was open, you wouldn't need to laap or use footwork, you'd simple strike from where you are.