It's a perfect messaging system.. That's it.
The best utility for such phenomena is to transfer value. Therefore by definition it is a peer to peer electronic cash system. That's what it does best. Transfers value over messaging system.
Discussion
It holds the first inscription style message from Satoshi in genesis block just fine you know.
Yes, indeed, I have noticed, it is there for everyone to study why Bitcoin has been created in first place.
It is a cool geeky cypherpunk trick, so it even contains "Banksy", ten years after his first graffiti was ever created. This might even lead us to something else that happened in 1999...but doesn't mean Bitcoin will replace Microsoft Paint.
https://www.reddit.com/r/Bitcoin/comments/23km92/potential_post_by_satoshi_nakamoto_in_1999/
Cypherpunks tried to create independent digital currency to separate money from state for decades.
