yes if you want to compete in individuals and your team does not go you are still able to perform. and they only seperate the athletes based on ages not skill level.
The choreography really makes the routine. if the choreography is good then the routine is exciting to watch and the music just adds to the energy level.
from a coach's point of view....when everyone is dressed the same it is easier to pick out who is off count or messing up in anyway. The team looks better when they match too.