I'm friends with a professional stage fighter, who trained under a man who is considered one of the best in the U.S. They all love this scene. The film mentions Bonetti's Defense, Capo Ferro, and Agrippa, all real-life swordsman or maneuvers. And the moves used in the movie are accurate. They even teach excerpts from the fight in stage-combat schools. It remains a perennial favorite. In the film, it is a fight between two masters, so the fight should be drawn out, show different fighting styles, cover different terrain, etc.. whereas in real life it would be over faster. Of the stage-combat fighters I know, they love this scene.
Stage/film fencing is different from competitive fencing, in that its goal is to be graceful, exciting, and interesting to the audience. Competitive fencing can be confusing, hard to follow, and even boring to watch for non-aficionados.
I agree. They add details to the way they fenced in tthis film to make it more iinteresting. Real fencing, you don't switch hands halfway through either.