You made a good point and i have agree about Caroline, she did a good job as first lady. And I agree that Casiraghis were never interested in manage Monaco, especially Andrea. But I have to disagree with the rest. Caroline's children do not have any accomplishment to stand out, but Pierre can exceed managing his father company. Anyway, as you said, they are just living their lives, however, think they give the impression of being spoiled and somewhat out of touch with reality.
I say this because for a long time the Casiraghis were the presumptive heirs so all the spotlight went to the trio, and they are an important "reference" of what Jacques and Gabriella can became or not. In fact, I was not referring to Ducruets, since they are younger and are still graduating.
Also, they do things to the principality because they are part of the princely family and maintain Monaco is of their best interests.
I don't see anything of Grace in Stephanie and Caroline. Caroline is a copy of her paternal grandmother, with more defined and refined features. They could be twins. Stephanie is also fully Grimaldi. Stephanie and Caroline are gorgeus on her own way, but I see Grace as a diferent kind of beauty. But here says someone who can't identify characteristics in the twins, so maybe I'm just bad to observe this kind of detail. But I respect your opinion!
Anyway, maybe it's too early, but i wonder when Jacques and Gabriella get older, they'll be educated between Paris and Monaco like his father, or will stay in Monaco and surroundings? For some odd reason, I can't see Charlene living in Paris