Sort:  

7/ Web3 allows apps to run securely and without interference, which then, and only then, turn them into decentralized apps. There is no single point of failure. Web3 won't be able to bring the entire system down.

8/ Besides the technical aspect, Web3 offers true transparency, which offers trustless transactions/collaborations/agreements and so on. This is certainly not possible with Web2, which is also prone to online scammers who abuse Web2.

9/ In short: dApps can only run on Web3 because Web3 is a decentralized internet infrastructure. Web2 is not decentralized as it is in the hands of a few large companies, which makes it centralized by default.

This looks funny as a thread because it's really one user replying to himself in succession.