Depends how you define useless. They're pretty good at demonstrating what happens when the immature, privileged assholes of this world run amok with shitty ideas, devoid of any true foresight or reflection.
They're also pretty good at demonstrating how a borderless financial system can facilitate innovation and development whilst retaining IP without VCs (Aave, Uniswap).
Now all we need is the autogenerated whitepapers.
A bold statement is expected to have an argument. A trustless, censorship-resistant ledger is fundamentally useless? Come on.