Earlier quoted context omitted.
> I still can't send money to an US account without paying absurd fees. You think that is a technological problem? Using crypto appears cheap (despite being inferior technology) because it simply skips 99% of what banks are doing.
Well, clearly I don't need 99% of whatever the bank is doing to send a transaction between two accounts I own. Add to that all the things that many banks continuously fail to provide, like proper OpsSec, transparent fees, full programmability via APIs. > despite being inferior technology Could you clarify? Are you talking about a particular protocol, or an implementation component, or mean crypto in general?
a) Theory: In any engineering or optimisation problem, adding a constraint makes the solution not better, and, if the constraint is binding, worse. So, we would not expect distributed state machine replication (which was solved in the late 90s, with BFT-style consensus such as Paxos and Raft etc.) to get better by requiring permissionlessness. (And the latter is, in my view, the actual defining characteristic of what's now known as blockchain; though of course you have a couple of permissioned blockchains that are basically rebranding of existing technology to ride the hype-train.)
b) Practice: You could trivially run a BTC (ie, Longest Chain Rule) or ETH (ie, BFT-type) style network with extremely high reliability with some, say, 10 nodes that are permissioned and (at least 51%) trusted. That would use around 10-100 W (and you could probably achieve far higher throughput). Instead, BTC uses 20 GW, ETH around 1 MW. So, the requirement of permissionlessness increases energy usage by a factor of several thousand to billions.
Furthermore, you lose many many other features of centralised systems (such as that you can correct mistakes cheaply, replace lost keys, undo fraud, etc.)
So, basically, you employ a vastly inferior technology, just so you can circumvent the law. Really don't see why anyone should support that.