>Because blockchain keeps promising things and never delivering anything of actual value.

Which is true for every early field. I was around in the 2001 dot-com bubble, and it wasn't different. AI has a 70-year history of broken promises, but lately seems to come into it's own. Quantum computing is another hyped tech that may or may not change the world. Video-telephony was hashed out in the 1970's and only after roughly 2010 has become reality.

>That does what exactly? Wasting energy to determine if I can transfer $0.3 to my friend to demo it? Suppose you wired them and ran scientific studies/simulations. You’d probably get more useful results out of the energy you just spent.

All snark aside, it's much more than sending money around. You have a fully digital system of distributed apps that can interact and very strong assurances to authenticity of the results. Finance is only one area where that sounds interesting, logistics, provenance, data recording in regulated fields like health-care or polluting industries, notary services, cadastral land registers, IoT are all fields that could profit from machine-to-machine interactions that are free from human interaction.

> Because blockchain keeps promising things and never delivering anything of actual value

My friends in Argentina would disagree

Blockchains (Ethereum specifically), cryptocurrencies and decentralized finance have allowed them to exit their broken financial system and survive hyperinflation.

They all get paid in stablecoins across borders, self-secure their funds using smart wallets like Argent or Gnosis, and earn good interest rates using lending protocols.

I think many of us forget how broken the financial system are outside of western developed countries.

The value proposition in my head is you can pseudo-anonymously transfer any amount of value for almost no fee across any border to anyone else in the network within minutes. The implementation details aren’t great (energy wastage) but it is a working MVP of that imo.