Well, some of that stuff has nothing to do with appearance. Or even Disneyland. It's just working with the public at any job; Target, Delta, Nordstrom, In-N-Out, even the Gas-N-Go.
But I take it from your non-answer to my question, you don't feel that tats and purple hair supports the Disneyland show at Peter Pan's Flight or Storybook Land or the Mad Tea Party?
We aren't talking about customer service skills, we're talking about showmanship.
Disneyland is a show. It's why the employees are called Cast Members, because they have a role to play in that show. A perfectly coiffed CM can provide bad customer service, and a CM with skull tats on his arms can provide good customer service. But at what point do the skull tats clash with the show of Main Street USA or Fantasyland or Frontierland?
As for wearing your hair in a natural, I've seen Black CM's wearing their hair that way for decades. I don't think styling your hair in a natural was forbidden in the old rules, was it? If it was, they did a horrible job of enforcing that.