I was educated by nuns. None of them, of course, did anything resembling the actions of Lydia from The Handmaid's Tale, but they taught me a work ethic, that I had to toe the line, that I had to step up and do my work, and that we would stay until it was done, and that came from a devotion to making you the best person you can be. That's the take I have on Lydia. She knows her actions are firm and sometimes very harsh, but she also looks after them.
The soybean itself is a notably inauspicious staple food; it contains a whole assortment of "antinutrients" - compounds that actually block the body's absorption of vitamins and minerals, interfere with the hormonal system, and prevent the body from breaking down the proteins of the soy itself.