Thanks for the article. The Problem however that especially the ownership part / privacy part isn't true practically. It's true in theory but it comes with 2 problems:
1) All major "decentralized" platforms are central which dissolves the whole thought of being decentralized. Centralizing decentralization doesn't work as per theory. Sure, you can use a private device to store your data such as Ledger but only few people do. Most people trust the platforms.
2) Once your privacy is uncovered, it's kinda infinitely uncovered as every action on the blockchain is public. So imagine you got a stalker and the stalker knows your home adress: You can move. But with blockchain it isn't that easy. It actually becomes very tricky to move stuff silently because source and target adress are visible on the blockchain so it's kinda a neverending hide-and-seek game.
Some more problems in general are being uncovered here: https://web3isgoinggreat.com/
You also mentioned encryption but this isn't exclusive for blockchain. Everything sent over HTTPS protocol is encrypted and if you have sensitive data then data is also encrypted on the server such as in the platform 1password.