So your son totally has the academic chops and a couple of decent but not world class extracurriculars. In essence, a Just like my son (Princeton 2021). In my opinion (and the opinion of a top 10 adcom dean), for this group of kids what triggers an acceptance is the essays, the letters of rec, the interview, and how all these things “feel” to the one or two admissions committee readers that happen to get assigned your son’s application. In that sense, well rounded, non-world class kids get in because their application has some undefinable spark, and that spark luckily resonates with the random adcom member that gets his app.