If a person tries going Primal and has weeks of gastronomic discomfort and no craving for PB foods, that person should do something else.
If a person goes Primal and has success losing a lot of weight and regaining health, but then plateaus for years and notices their health declining in ways like thinning hair and cold extremities and decreased libido, that person should do something else like investigating the re-addition of grains and sugar in sensible ways.
We should be as Primal as we're comfortable with, really.
You lousy kids! Get off my savannah!