One of the limitations that did not allow shugo to become feudal lords was the disturbance of the Northern and Southern courts in the Muromachi period that led to the political instability and complications.
「守護の領主化」といってもそこには限界があり、室町時代が、南北朝の争乱後も常に中央、地方問わず波乱含みで政治的に不安定だった理由ともなっていた。