There’s difference between receiving a committee letter and receiving a strong committee letter. Med school applicants are ranked by their health profession committee Into categories based on how strong their application portfolio is relative to other students who are applying from the school. So don’t think for a minute that just because a school says it has no requirements for receiving a committee letter that everyone applying from the school is going to get their highest endorsement. (Or even a recommendation that is offered without any reservations.)
Also based upon D’s experiences at a private university well known for its pre-med program–there is substantial amount of subtle and not-at-all-subtle discouragement given to students whose application falls short of expectations long before the student even applies for a committee letter