Eh.
Prior to her current role my gf spent about a decade as the head of a very elite private elementary school (she's been in education for 35 years now). Certainly ten figure families represented in the student body with names you would recognize as such. The school had access to all of the resources they could ask for and they did very well on paper. However, the attitude of the students was qualitatively different (and in my gf's opinion much worse) than those of her current students.
It's fun to imagine a collection of rock star educators huddled around every child just constantly feeding their intellectual curiosity, but the reality is most of those kids just aren't hungry. They live lives of comfortable inconsequentiality which, on average, seems to rob something from human curiosity and drive.
I have some cousins (on the wealthier branch of the family) who were the "middle class" students at a school like that. Their dad was a specialist doctor who made a fair amount of money as an expert witness in trials. They came out of it extremely hungry to reach the socioeconomic class of their peers. One is an orthopedic surgeon who did her fellowship in snow sports injuries in Vail, and one is starting his Wharton MBA in the fall.
Meanwhile other relatives who went to good public schools came out of it with a thirst for knowledge and have had eclectic careers with degrees earned out of personal interest, and are happily living middle class lives in midsize cities.