I too have vertical ridges on my nails. My thumbs are the only ones with half moons. They look like the Red Luna example from your nail disorder link. Some do grow flat but not all. They chip quite easily and as someone else mentioned they seem to flake as if in layers.
One thing I did notice is that when, for about four months, I took nutritional supplements and vitamins daily, the half moons began to slowly reappear, starting with the index finger. They never did appear on my pinkies.