You obviously read none of the linked articles. They would have answered your assertion that not having readily apparent intolerances = tolerating grains well and that tolerating them means they are healthy for you. There is a level of health being "fine" that you can uncover with a paleo diet. Until you reach that level, you have no clue it exists.
And for ahuderot, I posted those links because he hoped Mark would write a response. Mark has already written hundreds of blog posts on the topic so has no need to post a response in the forum.
Female, 5'3", 50, Max squat: 202.5lbs. Max deadlift: 225 x 3.