Printing press came out 59 years after the Great Revolt of 1381 or the Jacquerie or any of the popular revolts of the late medieval period. The printing press is not necessary for people to develop ideology or to fight for justice.
And I have not said that Westeros has fluctuated between the two. Some of its political organization is more reminiscent of the earlier period, but it’s quite clearly late medieval in terms of economic development, and the Renaissance is going on just across the Narrow Sea.