Agree with 99% of your post, but these two ideas contradict each other.
Zoning/land use restrictions are things that lower the concentration of wealth (they literally cap the wealth of a parcel of land).
When you reduce/eliminate zoning controls, you will increase concentration of wealth, because the value of that land is now allowed to rise as high as private capital will allow it -- higher than it could have ever risen before. (This can be seen by the cities in the US currently reducing/eliminating their zoning).
If the entire urban area were allowed to incrementally and organically build to market demand, then land value would not be so concentrated in the core.
That's also a thing too, but I'm referring to the trend of cities to remove zoning city-wide, all at once.