However your people have to be smart enough to want to maintain the system.
.
Not Necessarily.
Japan when it was going through this had a lot of political assassinations taking place and hijackings or over ruling of the systems which is what lead it to join the global war in the first place. Even the individual branches of its army where moving independently against there actual systems rules.
The actual reason is a large literate population capable of being bureaucrats needs to exist and the ideology of some kind of unity needs to exist. Which in most of these cases back then around the world is nationalism and didn't exist in the mind of the people eg China was a bunch of States ruled by warlords.
Egypt tried to do the same thing but they failed because they didn't have a literate populations and the only other literate guys in the country also are vying for power.
A small minority or a specific class of people eg scholars in the Islamic world isn't enough and this reason specifically is why Japan who had a highly literate population and a nationalist mindset and set national ideologies unlike China and Korea ended up becoming a superpower and developing the fastest out of them. the Koreans and Chinese adopted and learned from them. With China eventually over taking them because of the potential it has with a larger population and a good amount of literacy but no set ideology that united all Chinese at the time.
but once things settled for countries like China and Korea they where able to advance fast.