Martial arts have prospered for a thousand years, the sacred lands remain aloof and superior, sects dominate the immortal mountains, and noble families establish cities and occupy land, clearly demarcating their territories.
Perhaps there are rises and falls, but the overall structure of the upper class remains the same as it was a thousand years ago.
The root cause is naturally the many generations of hard work and bravery of the Sacred Land Sects, but more so, the monopoly caused by rigid class divisions.
For ordinary people, Fierce Realm is both a desired and unreachable barrier, and the biggest problem with not crossing this barrier is a short lifespan.
Even in places as affluent as Xiling, there are scarce elderly people among the commoners.