> sharing data between those actors is still a heavy duty process.

Utter nonsense. Everything is HARDER TO DO when done through a blockchain.

> Trusting the data coming to you from other actors is still a high risk area

Utter nonsense. Public / private key encryption solves this in the same way a blockchain would, because a blockchain uses public / private key encryption.

> Who's going to own that central DB and pay for everything going into and out of it?

Walmart. Or IBM. It would likely cost less than $50/month of AWS resources, including backups and redundancy.