Echoing GP, I also do not find sending crypto to be all that nerve wracking. I frankly find sending a wire to be a lot more stressful (since I understand it a lot less well).
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.
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.
Irreversibly transferring funds and having complete ownership of them once they are in your possession is a huge feature.
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.
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.
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?