I'll come back and respond to your points later (have to go to work in a few minutes) but I probably agree with you more than I disagree. About grains and legumes though. If they were so horrible for us, then why is it that one of the main foods that kids ate when I was young were Peanut Butter and Jelly Sandwiches, and it never harmed any of us?
I mean it had wheat and peanuts in them! I never heard back then of anyone having a bad reaction to the bread or to the peanuts (or any other type of nut, legume or not). If you listened to the modern gluten-free advocates and the "nut free zone" advocates then you'd assume all of us kids should've been falling on the floor having seizures.
I don't personally believe there's anything harmful in grains or nuts or legumes for most healthy individuals. I also have a tendency to believe that most gluten sensitivities and nut allergies are psychosomatic or completely fake because I never heard of any of this back in the 80s when I was growing up and every kid brought a PB&J to lunch (without having an anaphylactic shock attack, imagine that). Now I know that for a small portion of the population, that there are real wheat allergies, peanut allergies, celiac disease, etc. so if you have these conditions then I'm not talking about you, but I don't think it's nearly as common as people think it is.