Can you elaborate on how the S curve is being "antithiesed"?
The theory behind using (ideally few) simple curves (CSI) is called line economy. Simple curves can be used by the draftsperson in a very controlled way, and reducing the overall complexity of the form leads to very easily readable shapes that look pleasant. There are some minor caveats, like only using single curves ("C"s) on the whole figure, placing them symmetrical and have their ends always match, can lead to snowmansyndrom, where the body appears to be assembled out of a collection of elongated spheres, like a balloon animal.
I am not aware of specific problems with the S-curve, and use it a lot. The human spine, which is often the basis for the Line of action, naturally follows an S-curve when seen from the side in an upright posture, and S-curves appear all the time on various limbs.
I am by far not a master draftsman, but I think I can handle line economy decently well, you can check my results on my sketchbook here or on artstation.com/stefanbast. If you have concrete questions about line economy, I will try to answer them to the best of my knowledge.