I would really not worry much about the GPA, the concern about less flexibility in training and competition to get recruited is definitely valid. Top boarding school is likely to make your child a better student, but it could well be at the expense of their athletic growth. And coaches pick their players based on athletic ability first and foremost.
The logistics of going off campus for club practices, tournaments etc. are also quite difficult. At most schools boarding students are not allowed to have cars on campus, nor are they allowed to be driven by day students. This year due to covid our school banned Ubers and other for hire transportation that a lot of boarding school kids relied upon to get places off campus. They are also not allowed to use public transportation. So their only option is for parents to come and drive them places or parents of their day student friends to drive them assuming their kids are on the same club team etc. But by junior year most of the day students drive themselves so this is a big ask to make especially as a regular thing.
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