Take Lee Hsien Loong and Chan Chun Sing as examples.
Loong born into a educated, successful Prime Minister family. Chan, born into a peasant single parent family, always trying to make ends meet.
Loong, no matter how fuckup you may think he is, speaks proper English, clear diction, and clarity. Chan, after all these years, still fumbling in his speeches after tons of money spent on his scholarship and training.
However, both have accumulative advantages.
Loong, by virtue of his good family background, early coaching by his parents and opportunities; Chan, picking up his accumulative advantages from his later presidential scholarships and connections along the way through his time in PAP.
My simple point is ACCUMULATIVE ADVANTAGES plays a large part in your success, whether you are born in the right family (Loong) or you are lucky, and pick up along the way like Chan.
Similarly, had Ching not married Loong, she would not have those ACCUMULATIVE ADVANTAGES that she has today. She wouldn't be what she is today. No?