As further research was done after World War II, it became apparent that the eras were overrated by people in the literary nobility in the middle and lower classes who were potentially frustrated at the system of rule at the time, and the actual policies of that time were merely an extension of the ones by the Emperor Uda era and under Insei (rule by the retired emperor) of consecutive reign by Retired Emperor Uda.
第二次世界大戦後に研究が進むと、潜在的に不満を抱いていた中下流の文人貴族層による過大な評価であることが明らかとなり、またその時期の実際の政策も宇多天皇期及びその後の宇多上皇による事実上の院政下で行われたものの延長でしかないことが明らかになった。