OP- can you explain what your actual concern is?
All competitive fields have weed-out mechanisms, whether or not they are explicit. There are law schools where virtually anyone with a pulse and a checkbook can be admitted- but their pass rates for the bar are terrible, and if you can’t pass the bar, you can’t practice law. So- weed-out. It just comes three years and tons of money too late.
Are you worried about a kid not getting admitted to a program where he or she WOULD be successful, or a kid getting admitted to a field where ultimately he or she wouldn’t be successful (i.e. a kid getting into engineering with weak math skills who gets advised to find another major).
Not sure specifically what you are asking.