Love and the whip.

People loved their nation, or feared it, but they employed people, artisans, stone masons, knowledge passed down generationally by apprenticeship and by guild. They worked much harder and with their hands, instead of crappier automated machines that cannot sculpt and cannot carve, but can make these other tunnels, and skyscrapers and concrete tenements. Production crafted specific molds and employed dedicated tradesman from guilds. They ruled with ironclad resolve to achieve what machines cannot. Machines make it easier until working that stone in the same methods becomes more of a lost art. Where today, despite some functionality. How long does it take to make a stone mason today. They really don't exist on the scale they did then. Where more was stone and wood then. It goes for much of that World then, everything made by hand, or by hands creating everything. Replaced by machines using less hands and making things that don't last.

No love, no whip.

Most of it was killed off in the World Wars. Replaced by automation and corporation. Yes there are still dedicated studies today, except by being high demand, faster replaces it with something breakable, and does not last. It isn't cost effective. Somebody else will invest and create something even uglier.