Proof of work helps to protect the network from numerous different attacks. Proof of work may not be the most efficient solution but it is still one of the most popular methods for reaching consensus in blockchains.

There is always a trade-off between scalability and decentralization. PoW achieves a higher degree of decentralization, but not a scalable consensus mechanism. There are many types of decentralization(geographical, political, architectural), if any coin has achieved a comprehensive decentralization, then it is none other than Bitcoin. The entire crypto community agrees to this point.

Another important point is that Bitcoin wants to remain what it is in 2009, they don't want to change any of the governance parameters and other critical things and that instill confidence in investors.

If we are trying to send money, the Middle man is bank. Let say, I want to send money to my friend Rishabh. Rishabh leaves in America and he has an account in Bank-X.

The intermediary bank in the wire transfer is the best example of how the sender and receiver are hassled by the traditional banking system, on top of that the Banks charge premiums in the form of a percentage of fees for the transfer to happen. There is no such thing as percentage fees in Bitcoin transfer, regardless of how much you send over the Bitcoin network, there is a fixed low amount of network fees. That is how Bitcoin solves this problem interface.

Thank you.

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