Because it is sophisticated and when performed well, it is not only formidable but also beautiful and harmonic.
Martial art is the practice of disciplines used in combat. While most people relate the term to the Asian techniques such as kung fu, karate and kendo, it also includes the use of swords, guns,...
yes, you might notice that some Martial Arts having graceful, flowing movements as if the artist was dancing.
Too many and too many variations of each.
Jiu-Jitsu is roughly translated from Japanese to "the gentle art" in English.