And the opposite seems to be true as well: that more self expression seems to automatically translate into reduced customer service. While people keep insisting that the rules and standards are important (and yes, I agree they are), they can't really give a detailed example of why seeing a person with a tattoo or piercing creates a reduced experience.
If the implication is really supposed to be that people are in a role and this further deviates from an ideal image of that role, then the case needs to be made why that's more important than the Cast Member's comfort. Obviously LOTS of exceptions have been made (forever) in creating the image of a role that aligned with Cast comfort over realism. Gender based stereotypes have been broken even when a role would traditionally require only one gender (like the Jungle Cruise). Maybe historical accuracy demands that only certain races of people be in a role? Cast Members are required to shower when, despite historical accuracy demanding otherwise. Cast Members are allowed to wear sunblock and sunglasses to protect themselves from the heat and plastic rain ponchos, because safety is more important than show right?
So if you make all these concessions on how accurately a role is portrayed, why draw the line at tattoos?