They could, but whether they do it by gating anyone who doesn't meet standards OFF... or making more resources to learn basics more visible is a major point of contention.
Also.. SHOULD they?
Is this supposed population of F rank players that huge that this is even necessary? Or is it being wildly exaggerated and/or including people who are slightly below calibrated thresholds who might slow things down but aren't any more than a minor inconvenience?