Confucianism (at least of that time) = somewhat extreme conservativsm.
Thus, it did not approve of world-spanning epic voyages, expanding-crazy-seemingly-pointless-at-the-time-innovations, or conquer-landmasses-thousands-of-miles-away campaigns. Rather, it believed the Emperor shoulda focused more on improving agricultural output and stuff like that
there was constantly a clash between the more liberal and conservative factions of the court. in the majority of the cases, the conservatives won; had they not, even in a few instances, then i am very sure China would not be like it is today - possibly much more powerful and affluent.