I don’t think Winry gets enough credit as a genius. Like, automail would need her to understand engineering, robotics, anatomy, and particularly how nervous systems work, and she’s technically a surgeon. She was already a regular helper at Pinako’s shop when she was 11. At 15, she walked into a town full of top automail experts and impressed all but one of them with a rush-order arm she’d made. Then, she took over one person’s shop so thoroughly, her customers won’t even let someone else make the outer casings. On top of that, she read medical books as a child and not only understood them, but retained enough of it to successfully deliver a baby years later even though that had nothing to do with her preferred field. And she didn’t have any help from the Truth.
Winry might not be an alchemist, but she’s a medical and engineering genius and somebody needs to tell her that right now.