One of the main arguments in favor of getting rid of the feudal system is that it was based on the exploitation of peasants by landlords. Peasants were required to pay high rents and taxes to the lords, and they were often forced to work long hours in poor conditions. This exploitation kept peasants in poverty and made it difficult for them to improve their lives.
Another argument against the feudal system is that it was highly decentralized and fragmented. This made it difficult to maintain law and order, and it often led to conflict between different lords. The Hundred Years' War, for example, was a long and bloody conflict between England and France that was largely caused by the feudal system.
Finally, the feudal system was also criticized for being outdated and inefficient. By the late Middle Ages, the feudal system was no longer able to meet the needs of a changing society. The rise of trade and commerce, the growth of cities, and the increasing power of the nation-state all contributed to the decline of the feudal system.
Overall, there are a number of reasons why it may have been considered advantageous to get rid of the feudal system. However, it is important to remember that the feudal system was also a complex and dynamic institution that had both positive and negative aspects.