This would be the case in construction work, as an example. In their effort to balance the two opposing drives, people who have great facial skills see subtle little differences easily, and they do not need as much difference as other people to tell people apart. In effect, their skills cause both of those drives to push the desired appearance of those people in the same direction - they want to look much more like each other than other people do. This is why a group of lawyers will tend to look a lot more alike than a group of construction workers. Many, without giving it much thought, impose their own view of the world on others in the workplace, not realizing the extent of problems it may cause for people who are greatly different from them, such as face blind people.
Identity is a very strong drive, and failure to acquiesce to it causes stress.
For some people the stress in complying is too great to bear along with the added stress that one gets in general from not being able to recognize people around the workplace. Even if one is allowed to maintain his personal identity, if everyone else in the workplace acquiesces in a scheme to make them all look alike, this still makes it tougher than it would otherwise be for the face blind person. He must still constantly struggle to tell people apart who mostly look alike. In addition, it may well be harder for him to like people who mostly look alike. As one would expect, clothing and hair styles preferred by those at the high end of the face-skills scale are the worst styles of all for telling people apart.