The level of visibility of any individual dancer while on stage, is directly linked to the amount of data he or she are processing and managing in real time. 

Group unisons are a good example for that. 

When the technical aspects of achieving and maintaining a unison are external (counts, a fixed relation to the music etc), the result is a disappearance of individual presence into an anonymous mass of people. 

When unisons are managed without these external crutches, and are left to be negotiated and managed in real time by the dancers, the result will usually be much more accurate, and at the same time, the individual presence of each dancer will shine intensely.