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. The principles of fencing are the same now as ever, and their applicability beyond fencing as important as ever. This one is interesting.