Oh, I didn't realize you were merely speaking about your opinion of the design. I thought you meant there was a physical defect/ weakness in the case design, such that it is easily damaged (the way lugs on Patek 5119s are delicate and known for breaking off if one accidentally bangs it against something). Personally, I like the Lange cases and their lugs but again that's subjective.
The new Parmigianis are a big improvement over the old ones, but I'm still not in love with them. At least not yet.
Nah nothing physically wrong with them, just boring/half assed design compared to others in the same range IMO. Now that Lange does the case work themselves (IIRC?) I think it would be good if they did something a little more unique.