Earlier quoted context omitted.
They should do that with sports too, since it's fair and provides a reasonable basis for comparison
At every age, there's a high attrition of students participating in competitive sports, until only a tiny elite remains. Is that what we want for reading and math?
The biggest red flag here for me is not that the tiny elite remain, it's that life circumstances will dictate that the majority of the tiny elite will continue to come from privileged families who have the time and resources to give their kids a leg up. BUT pushing kids into places where they objectively cannot compete intellectually or physically under the auspices of fairness is the devil's work. We need constant work at creating equality and to lower barriers to social services, not "fairness" and pretending everyone is already equal.