I might need to do something with blockchains at work and I need to follow the scene and study stuff. The behavior you described here is too common. Sometimes I feel everybody has too much money involved and everybody is cheating everybody... So there definitely is no trust.
I asked a few questions and he dodged them like a professional politician:
* what do you do if you need to reverse a transaction (lets say, court order)
* what if someone loses his wallet/password
* some people claims blockchain is over-hyped
He said that I being skeptical proves my ignorance and I should study more about the subject instead of challenge him.
Remembered the short tale "The Emperor's new clothes", I'm unable to see the king's clothes because they are made of a magic fabric invisible to the stupid. I guess the magic fabric is made of blockchain.