> You can dispute it in the case of some hypothetical future architecture that requires physical real world enforcement of some state change on a decentralised ledger, sure, there you might have a point, who can say what the future holds?
It's the present day, not some future. You need real world enforcement of real world states.
I just realized! Cryptocurrency bros are pure function bros. Everything is pure and has no side effects!
Except for the fact that the world is a <<result of side effects>>. All that's nice about computers has to do with them printing to screen/paper, sending across the network, etc...
Similar story with money. All we care about is that effects they have on real life.
> that attack can be ruled out if you self custody.
Which puts a huge target on your head for any kind of real world malicious actor.