Why is unity sometimes regarded as the most important of all design principles?

There is one saying the answers this question... Team work makes a dream work.

Beethoven was a deaf man and couldnt hear. he became famous for his classical pieces. and there ye go.vivaldi was a true one hit wonder classical artist. hes known for his classical piece the four seasons. he was although wasn't as great as beethoven and yea 'ere ye a go.

If you could give us the questions i can see if i can you! : )