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edit: Thank you for comment!
I think, the fact that it is decentralized, your data is not in control by some company. How would you make sure that whatsapp servers are secure?
Immutability, you can pretty much make contracts and refer back to it in case of disputes. As I mentioned there is an argument can be made, if it is immutable, if data is stored on blockchain forever then How do you make sure that encryption will not be broken in future? I think if we have confidential transactions that would solve this issue as well.
Encryption itself probably will be similar, with multiple choices.

It's not about the encryption. WhatsApp has good encryption. However, users don't ask for a chat app. They have many. They ask for built-in chat app. That would be the main difference for many users.
The extra is that nobody could cancel, delete your account or messages, and the blockchain has no TOS like WhatsApp has.

If you spell out the protocol, nobody can complain. It should be built-in as should voip; imagine the volume upside!

Built in VoIP would be something indeed...

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