It's hard to measure complexity and predict network usage. Centralized systems are also a lot easier to design and implement and make fast. Making good decent

It's hard to measure complexity and predict network usage. Centralized systems are also a lot easier to design and implement and make fast. Making good decentralized systems is a real research project, and often flat-out impossible. Often, decentralized systems push down their complexity to the user of the system -- see the decentralized key-value stores that push conflict handling down to the client.