My opinion is based on a Spider-Man amalgam as opposed to one specific Spider-Man. I always think of the younger teenage Spidey from older comics, various cartoons, etc. I know that his physique has varied over the years and the many iterations of his appearances. The M32 body just seemed a little too, peak physical condition. Out of the suit, people would notice Peter's improved physique, but that's neither here nor there for what AFM was doing. He picked the best figure for articulation. Now if TBLeague could add a body closer to the, we'll call it, "less overdeveloped musculature" TT type body, it would be a bang on home run. But the M32 fit his needs and serves it purpose for what he needed, posability. He did the best with what he could get and it worked.