The CDS information may not tell enough of a story for applicants to be realistic about their chances. A 6% overall admit rate at a super selective school may not reflect that 3.3/25 applicants had a <1% admit rate, while 4.0/35 applicants may have had a higher than 6% admit rate (though still not high enough to be anything but a reach). Also, for colleges that admit by major or division, overall stats may not reflect the difficulty of admission for a given major or division.