The logic behind this one is fascinating. No one fights duels anymore. We have the Olympic fencing now. We have cars to drive now. Nobody has to walk very much anymore.
Nobody rides horses around.
We have cars, trains, buses, planes. Nobody uses a javelin or discus in war anymore. Bach has been dead a long time. What was true a hundred years ago or two hundred, or five hundred, may very well still be true. In the case of fencing, virtually everything that could be done with a sword was well-known by the 16th century.