> Anyway just wanted to note there is no known policy that would stop rural flight.

Actually, there is. Industry steering politics...

Look at Eastern Germany for example. After the 90s people fled in droves (and neo-Nazis moved in to pursue their dreams of "national befreite Zonen" settlements that they couldn't have in Western Germany), but "Silicon Saxony" is a lighthouse that attracts industries and talent from all over the world, even if Intel's fab plans shattered due to Intel's often-described internal issues.

The thing is, for this to work, governments and especially their politicians have to be willing to think decades in the future - and they have to put money where their mouth is, and build the surrounding infrastructure as well: roads, rail, high speed internet, schools and universities.

That, however, is where many Western governments utterly and completely failed ever since Thatcher and the emergence of rabid unchecked capitalism, tax races to the bottom, "trickle down" and "small state" ideology. When the government doesn't have funds to invest into developing the industries of the future, you'll get the issues that almost all Western societies have.

China in contrast has used the shitload of money they got from the Western countries over the last quarter century (when they joined the WTO) to do exactly this. For all that I hate the CCP for various reasons, their way of thinking in five-year plans plus even longer macroeconomic planning has proven to be incredibly successful.