Efficiency of computing and decentralization are tradeoffs. Decentralisation is not efficient , never will be, it is secure and resilient to resist central control. This is why bitcoin will never have the throughput of centralised computing, all the nodes globally, ideally, must see and verify each transaction and there are finite limits to achieving this. When people try and disolve these physical limitations we end up with a shitcoin. In 15 years 100s of thousands of shitcoins have tried and failed to recobcile this yet we still waste time moping  about it. Centralise small payments , decentralise the base money and the big payments. Trade convenience for security, that the bottom line. Use both in its respective place.