The whole point of the Disney look was so that cast members didn't "detract" from the show and become the show themselves. Examples of this would be unshaven beatniks in the 50s and hippies in the late 60s with long beards and hair. Alas, as time has gone on what we consider "appropriate" has changed drastically, along with a far more diverse workforce, comprised of people from many different nationalities and religions. Frankly the Disney Look was originally designed when the on-stage workforce was mostly white Anglo-Saxons.
Disney, as a progressive employer, must work to ensure the needs of their business are met without being too regressive in their Disney Look policies and continuing to embrace diversity in their workforce.
Complicating this is the fact the company has drastically underpaid its theme park employees and exhausted the labor pool in central Florida, which has resulted in a more dire need for talent and this has led to a relaxing of some standards with time (ie cornrows and goatees became allowed in the early aughts).
The policy has ALWAYS applied to on-stage, working cast only - not creative executives. Walt himself had a mustache when they weren't allowed per the Disney Look. He thought he looked "debonaire" with one.