We have to accept the fact that a centralized system will always be more efficient than a decentralized system. Just think why democratic governments are so slow at implementing anything. BUT some things are too important to be centralized which obviously comes at a drawback.
What does it has to do with centralized and decentralized system?
It's about power consumption due to Bitcoin mining and transacting.
Crypto can not be centralised.
I am not saying we should do anything. Bitcoin is what it is.
I'm simply making the observation, that decentralized systems are less efficient than centralized systems.
Bitcoin's decentralized nature requires thousands of miners to compete instead of collaborating.
If Bitcoin were centralized there would be no need to compete for mining Bitcoin because all the verification of transactions and issuing of new coins would happen by one single "miner".
This leads to higher electricity costs, more hardware costs, slow transactions...thus being less efficient.