Thinking about it, with the way this world works, bloodshed would be rather difficult to get rid of. The world cannot move much from the status quo since roles are assigned rather than picked. If society went towards peace, what would the combat-oriented people do? They would be out of jobs and their role is set in stone so if they decided to pick up a job not suited to them, they would be at a disadvantage compared to the people suited to said job. After the Sendoku period, Samurai were allowed to become bureaucrats, allowing for society to drift towards being more peaceful but the same cannot happen here. The system does not allow the world to adapt so change cannot happen.