Nicolas, that is a good question in general. Still I think people like you and me are very hard to please, because we reached a level (of craziness, knowledge, stupidity, ...) that is "strange" for most. Still we can dream ... 
Regarding the chronograph complication and its difficulties, this is not new to me and one of the reasons why I love it that much - if everything meets my expectations.
Regarding JLC, I can only say that I just looked at a full calendar in rose gold recently and it was more expensive than the example shown here. It was a nice watch and nothing felt "wrong", but not for the money asked. To each his own details he asks for 
Best,
Oliver