Client-Server model is expensive, complex, and prone to failure & attack
Today, most communications need to go through a centralized server, where it can be blocked or sabotaged, hacked into, or eavesdropped on.
Inefficient Network utilization results in waste of resource
The current Internet was designed for peak traffic but most of the time these networks are underutilized, wasting unused bandwidth every second.
Centralization of blockchain systems diminish trust
Many major blockchain projects use a handful of centralized servers to carry out consensus in the name of increasing transaction speed. This sacrifices trust and security, and diminishes the technical and economic strength of a true permissionless blockchain system.