I agree with your point about eating traditional preparations of grains being less problematic and many people seemingly not thinking about that at all for some

I agree with your point about eating traditional preparations of grains being less problematic and many people seemingly not thinking about that at all for some reason even when they run into problems. But, I think it may go a step further than that. If we zoom out on the timeline to the span of human evolution, eating grass seeds as a significant part of the diet is very, very, very strange. It wouldn’t surprise me if some human subpopulations, especially those who adopted agriculture later on, aren’t suited to eating grass seeds at all. And I’m just thinking about within European subpopulations. There were people roaming around the steppe when others were long settled. And beyond even that, the population increase enabled by wheat et al could plausibly produce a large enough competitive advantage for the group that some individuals having tummy problems probably would not register much on the selection pressure meter back in those days. I’ve come around to the idea that wheat sensitivity is probably real. I used to be quite skeptical also. I think if you told someone 30,000 years ago that the earth would be full of people eating mainly grass seeds, they would find the idea completely ridiculous.