[simiones]

> Bitcoin, Ethereum etc. are, potentially, self-contained, almost complete, final, financial systems.

...for a small village of maybe 1000 people? At the current transaction rate, they could barely handle that. And of course they don't handle disputes, loans, insurance, tech support, legal compliance, KYC and AML, or any other part of a financial system (you're even forgetting that someone needs to design and print the physical cards).

Bitcoin in particular does nothing more than verifying a handful of transactions per second (5? 7?) while consuming more electrical energy than all of the world's regular transaction processing hardware combined, perhaps with the exception of ATMs - which amounts to hundreds of millions of transactions per second, all over the world, in a truly decentralized system.