You know what is a great database with all those properties?

Your folder with git. There is nothing that you cant do with git that you can do with blockchains as a database.

About the BFT part, it fails the mention the very important part that it doesnt work without proof-of-work.

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So then when should we use p-o-w blockchains?

When you want to decentralize control - both, distribution & conflict resolution.