A uniform will help arrange people into categories and show them as being united together for a common purpose. This is how one can tell at a glance who is the superior and who is the subordinate. A person who knows the principle of organization knows the importance of subordination and uniformity. A uniform must be comfortable. The uniform helps to retain the integrity of the art.
All instructors strive to teach moves, principles, history, and etc.
Finally in my opinion a uniform should be worn in class and at personal work out times. To ignore the usefulness of a uniform is to ignore the roots of the art in which it comes. It mocks the very source in which their art hails. To misuse or over rate a uniform will only lead to pridefulness in the wearer and may quite possibly destroy the art in which they seek to preserve.