it is the distribution of "power" not distribution of "load". the power to make decisions, enforce rules, keep the employees (eg. miners) in line with those rules,... the fact that each node does all of this on its own means they are not relying on anybody else and make their own decisions hence keeping the network decentralized.
Great answer.
I think the next step in blockchains is distributing load - storage, CPU, network, etc. in a fair and trustless way, while maintaining the distribution in power. Blockchains such as bitcoin are vastly over-redundant.