My point is mining is always centralized. It's centralized around the physical devices, which means the physical device manufacturers. It's centralized in the same way plastic manufacturing companies have advantages in making shovels. The point is the economics are what provokes the decentralizing force, not "hash power" or mining.

If you get the economics right then you get an acceptable balance between security and performance. Mining itself is supposed to provide security and keep the network going but it's not by itself enough to promote decentralization. The entire incentive structure promotes decentralization or centralization according to the merits of it's game theoretical basis.