Soy milk questions

Two separate questions about soy milk:

  1. How come we make milk out of soybeans but not garbanzo, pinto or lima beans?

  2. How come I am so allergic to soy milk but can eat edamame, tofu and soy sauce?

  1. Presumably one can do so, but it may not taste so good. (I know there is such a thing as almond milk, for example, but that’s not another legume)

  2. Well, since you can eat soy in other forms presumably it’s not the soy causing the problem but some other ingredient in the soy milk.