Europe's constant internal feuding certainly didn't help. Too many kings had too many rivals. For example, the kingdom of Fàguó (OOC: France) exists
on paper, yes, but every lord of significant degree has a great deal of power within their demesne. The Son of Heaven wouldn't tolerate his provincial governors
that much autonomy, not without formal limits on their power.
The temporal power of the Catholic Church was (and still is) far too strong compared to that of their secular counterparts. Of course, piety is all well and good, but there is such a thing as moderation.
The so-called Holy Roman Empire imploded thanks to lack of central control. I understand that the title of Emperor/Kaiser still
technically exists amongst the peoples of Déguó (OOC: Germany), but it is totally meaningless nowadays, especially given several people have claimed it at the same time in the past. The only proper Emperor in Europe (strictly speaking) lives in Constantinople.
Maybe expanding the ideals of
Grand Master Kong (OOC: Confucius), or something like it. Each person and institution should proper deference, according to their station and degree, whilst their betters should maintain and uphold their right and proper responsibilities. Yīngguó (OOC: England) managed it, by curtailing the power of the over-mighty clergy and nobility, enhancing the merchant class to prominence to allow industrialisation, reforming their military, and restoring proper order and fealty towards their king.
OOC: Roleplaying a Chinese person, with a bit of a hard-on for a reformed version of Confucianism