Xiu Nuo actually knew about the limitation of the upper limit of cultivation imposed by the National Pulse.
But such situations generally occurred in individuals deeply entangled with the Mortal World, such as royalty from Mortal Dynasties embarking on the Immortal Path.
Or those whose cultivation relied on the nation's fortunes, individuals who committed themselves to improve their realm to make the nation prosper so their cultivation could reach greater heights.
But...whether it was royalty or State Preceptors, their cultivation would halt after reaching a certain stage.
After all, a Mortal Dynasty is still a Mortal Dynasty, no matter how developed it becomes, it cannot compare with certain sects in a world with Cultivators.
At that point, to break through, one can only wait for the demise of the Mortal Dynasty and sever worldly ties, risking possible death. If they survive, they can then rebuild anew.