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RE: Why can't humans survive on grasses?
I think I saw a video somewhere saying that, we as a human as evolved from our ancestors in terms of what we can eat and what we could not because of the relationship between the brain and stomach. Our ancestors have a big stomach and small brain while we were the opposite. We can't have both because the energy needed for running both would be enormous. That's why we can no longer process fibre which can be found abundantly in grasses.
I'm not sure how accurate is this information, but I'm sure felt that was interesting.
Unless there is an evidence pointing to the fact that our ancestors had multiple chambered stomach and chew cud like ruminants, a large stomach does not confer any adaptive advantage to digest fibre in any form. In essence, I do not think our ancestors were able to digest grasses. They could have been plant eaters but grasses were not part of their diets