What OP is referring to is that you don't need to trust people if the dex is on-chain and verifiable. FTX was a non-transparent and insolvent centralized exchange which wouldn't be possible if it was on-chain because anyone can see the funds that are available and the protocol would not allow leverage backed by non-existing collateral.
> Is there an undo button to reverse the transaction?
No there isn't. This is a double edge sword.
> All financial systems involve humans
To a degree, but centralized exchanges have more knobs controlled by humans while an on-chain dex and just be deployed once and require no human intervention. A dex can be audited fully on-chain and anyone can see if the contract has any master holder keys. The FTX fiasco is because they own all your crypto because they have the master keys. The future of finance is people being in charge of their own money and where no unexpected entity can arbitrarily inflate the supply, which is only possible with crypto.
What foogazi was perhaps suggesting is that no financial system can work if it doesn't account for fundamental human behavior - we make mistakes and we are greedy if not held accountable "off chain".
The blockchain is perfect when everyone acts in good faith and makes no mistakes.
In the real world, that's not the case. Unfortunately, you need centralized institutions to regulate financial transactions, control the supply of money and enforce laws when they're broken, reverse mistakes when they happen.
> The future of finance is people being in charge of their own money and where no unexpected entity can arbitrarily inflate the supply, which is only possible with crypto.
This is not the future, and it'll almost certainly never happen with crypto.
Then what is the future? Certainly not the government going haywire with the printer. It’s impossible to trustlessly verify the exact number of US dollars in circulation, but it’s trivial to do with cryptocurrencies.
Removing the possibility for human intervention doesn't make things more resilient quite the contrary. Removing human control of public policies, such as those involving the management of public resources, is downright anti-democratic and dumb. If you people intend to build a monetary system, you need to educate yourselves about monetary systems. The money supply must be managed (i.e. inflated and deflated in your unconventional parlance) in order to keep prices stable. An currency in which prices are not stable will never be used as currency by businesses because it would put them in danger of going out business due to price swings. Restricting the issuance of currency doesn't make the supply of such currency fixed. Look up how money is created by the banking system. Only a small part of the money supply is money created by central banks.
The money supply managed by an on-chain protocol where it’s fully open, trustless, and predictable is 100% times better then a small group of people at the treasury deciding to print money and inflate peoples savings always.
What OP is referring to is that you don't need to trust people if the dex is on-chain and verifiable. FTX was a non-transparent and insolvent centralized exchange which wouldn't be possible if it was on-chain because anyone can see the funds that are available and the protocol would not allow leverage backed by non-existing collateral.
> Is there an undo button to reverse the transaction?
No there isn't. This is a double edge sword.
> All financial systems involve humans
To a degree, but centralized exchanges have more knobs controlled by humans while an on-chain dex and just be deployed once and require no human intervention. A dex can be audited fully on-chain and anyone can see if the contract has any master holder keys. The FTX fiasco is because they own all your crypto because they have the master keys. The future of finance is people being in charge of their own money and where no unexpected entity can arbitrarily inflate the supply, which is only possible with crypto.