Farming tools converted to weapons were often either two handed or based on crushing instead of cutting like flails which makes them much more suited in fighting against plate armor than swords which were very öoor weapons against plate mail.
And as I mentioned already, in Japan only the samurai were allowed to have swords which was enforced by sword hunts.
And if you believe the FAQ in europe too swords were reserved for the nobility for a long time, although that was not as strictly enforced. Either way, swords were linked to nobility and partially also a symbol because of cost alone. You should watch your own video where he says that sword only became cheap in the late medieval era. By that point the association between swords and nobility was already establised.
Swords were also not really standard weapons but backup weapons.
Farming tools converted to weapons? Where are you getting this information? Medieval armies were not made up of peasants who hammered their wrought iron rakes and hoes into spears, and went to war with cooking pots for helmets.
Could a Peasant defeat a Knight in Battle?The Ten Most Important Weapons of the Middle Ages1. SwordsNo weapon is more associated with the Middle Ages than the sword. It was used throughout the medieval world, and as Sue Brunning explains, was more than just a weapon...For most of the Middle Ages, the sword was widely used among elite and common soldiers, with some variation between the size of its blade, and how its hilt and pommel were fashioned.Kelly DeVries and Kay Smith note that “since the earliest times the spear, together with the sword, was the most important and widely used offensive weapon for both the infantry and cavalry.” 
