For the great Confucian scholars of this era, retreating from society to write books is not an unfamiliar thing; to be accurate, they often do this.
Moreover, Fenggao has indeed become more prosperous than these great Confucian scholars could have imagined. Wherever you go, there are people buying things, and there are people everywhere, which is indeed a scene of governance and prosperity, but obviously, such a place is not suitable for writing books.
Even though Jian Yong allocated very secluded courtyards for this group of people, going in and out, seeing the crowdedness, would cause even the mindsets of great Confucian scholars to waver somewhat.
There's no helping it; flourishing prosperity can distract the eyes. Writing books requires finding a secluded place to think and write, which is most in line with their mindset.
