Say it with me: Blockchains mathematically prevent fraudulent misuse of deposits Yes, on/off ramps are an issue. Yes, blockchains do not prevent physical threats of violence or profound custodial negligence. No, SBF would not have been able to defraud millions of depositors on a blockchain where everyone self-custodied.
Hardly anybody wants to self custody. It's the literal reason banks got started. If blockchain can't even solve the most basic use case of the financial system, it's not going to replace it.
I'm not claiming anyone should hold all their net worth on a blockchain.
But blockchains do have extremely desirable properties in preventing fraud _on the chain_.
I would love to have mathematical proof that my government is not fraudulently misusing my tax dollars, at least at some level. Who wouldn't?
I would love to hold some portion of my assets in a way that no one, even the government, can seize it or freeze it. What if my government is Cyprus in 2013? What if my government is the 1940s Nazi government? I want to be able to flee the country without losing my livelihood to tyranny and abuse.