This is a brilliant writeup and must say you took time in giving details about decentralized Blockchain.

Decentralization has place a wide range of importance on blockchain such as;
Decentralization helps blockchain to determine the validity of data before it can be added to the blockchain.

Indeed the determination of validity of data captured my attention and I agree with you totally.
I equally agree with you about the limitations of decentralization:

High Volatility
Crime history
It limits non-tech investors

Best wishes