@Knacki
the funny is that the less density parts will have the less problem after subdivided. The denser are worst. Have a closer look on the xenoforge’s example.
But there’s a point on your statement. A serious problem after retopology and projection, shrinkwrapping. Try to bake nor or displ maps and have these artifacts there. An ugly tri effect on less denser areas. Now you have to smooth and resculpt details, losing any spontaneous stroke you had in sculptris.