The whole reason for the sabre fight is, of course, the action and the need to add some drama into the third act of the film, so the fall of Anakin is more... dramatic. It's not a realistic fight and I never expect it to be, it's like kung fu films, it's choreographed for the movie screen, it's not a real, authentic fight.
About the song on "ytmnd": I much prefer the MECO disco version of the Star Wars song!