I agree. Heroes like Hercules are obvs metahuman too, but are shown with big physiques because it's illustrative of their power.
The hyper-lean mass monster physique of the 90's and 2000's a la Ronnie Coleman and Jay Cutler, which true female bodybuilders are essentially trying to imitate, is falling by the wayside in favor of more classical, golden-era physiques for men. This prompts a reduction in the size of female physiques as well, making them likely less extreme overall, which I think is a good thing. Obvs characters like the Hulk, She-Hulk, or Bane are probably going to retain a more extreme "unnatural" look, but that's part of their character.