It is not incumbent on me to do any such thing.  The material has nothing to do with the subject of this article.  There is no reason to replace it.  I did not remove it because it is bad (although it may be - I haven't investigated the sourcing to see if it involves original synthesis or not - there were certainly at least one error of fact), but because it is irrelevant.  If I wrote a long essay about American culture in the article about Martin Van Buren, another editor would be justified in removing it as irrelevant.  Same deal here.  This material might be appropriate in an article about the Investiture Controversy (assuming it is not novel synthesis).  But it is simply unconnected to Frederick's life.  There is no need for a section about German culture in an article about a medieval German monarch not particularly noted for his promotion of culture.