[oh_sigh]

Don't be naive - the transaction is definitely reversible. It's just that enough Important people need to agree it is reversible. If it was an Important person who lost money, or the loss was big enough to be bad PR, they would hard fork the chain and pretend like the transaction never happened.

[chrisco255]

No it's irreversible. Ethereum had one hard fork in its history (the DAO hack of 2016) and it was contentious and caused a split in the community. It can't be done Willy nilly.

Wallets should do more to prevent these types of sends from occuring, providing warnings. But you should also never ever send $50K without a test transaction of some token amount first.