Your post is exactly what we are concerned with in our DC26’s decision.
Pros: excellent preparation for college; benefit from all that the BS experience has to
offer (especially broadening horizons from the somewhat insular, homogenous environment DC26 has experienced at private day school in an upscale suburban environment)
Cons: potentially risking lower GPA and not making required AI for target colleges; having less flexibility in training and competition required to excel in sport being recruited for
There are also other things we are now considering and weighing wrt ECs, clubs and religious groups, with some schools being stronger and having more support than others.