My understanding was that wires were quite difficult to reverse, and it's ACH transfers that can be reversed.

Regardless, the reversibility aspect has both positives and negatives. It does allow you to reverse transactions, but with the added complexity of the transaction not really settling until after that reversibility period passes. If I receive a crypto transfer (ex: a stablecoin), I can know that the money is actually mine within a few minutes, and can't be taken back. There are major benefits to that.

The risk of the money being fraudulently taken back is close to zero. If you are worrying about that happening, then you are either a fraudster yourself, or just being paranoid. There is no major benefit to not having this.

On the other hand, if a crypto transaction has any errors, the money is instantly lost forever, and nobody can help you.

There is no upside to that at all.

I have been the victim of chargeback fraud and major banking errors that resulted in major losses that took months to recover.

Irreversibly transferring funds and having complete ownership of them once they are in your possession is a huge feature.

I don’t know if you realize this but you proved my point perfectly.

Someone defrauded you, and you were able to recover the money.

With crypto, when you get defrauded, you will never see the money again. If you think there is no fraud in crypto, I have some things to sell you.

They never would have been able to access my funds in the first place if this was on a blockchain.

Your argument amounts to the same as relying on the police to return your car after it has been stolen and then declaring that as security.

Yes, my argument does amount to that.

Your argument amounts to claiming you have a car that is impossible to steal, and yet becomes permanently inoperable if you press the wrong button on the dashboard.

Being able to recover stolen property is a good thing, you know?