If you have a central entity that can generate key pairs then they may as well be running a database. It doesnt achieve decentralisation at all. It has nothing

If you have a central entity that can generate key pairs then they may as well be running a database. It doesnt achieve decentralisation at all. It has nothing to do with anonymity: anything based on identity is broken because it has an entity that can fake those identities -- you can't verify ID with code