In agreement!
Still, as you may know, pursuing math at a high level (olympiad and beyond) for pre-college students can often become isolating and therefore lonely. While there are some great mathletes (moppers and 2021 USAJMO winner with a perfect score) at my son’s current school, all of them are at upper school. I thought and hoped that at Exeter, there probably is a critical mass of serious mathy students, which would not only be helpful and motivating to my son, but could make math more fun and social for him.
Plus, many math tournaments like HMMT and summer or year-long math research opportunities are found on the East coast near Boston, which would be another plus for Exeter. I believe the highly effective OTIS (Olympiad Training for Individual Study) traces back its genesis to the material that Evan Chen (IMO gold medalist and USA Math Olympiad coach) developed while teaching Exeter students several years ago.