[ucha]

Attribution is important but you don't need the government to be able to do it without your authorization. You can very well have private unattributable transactions that you decide to disclose to the authorities only if you need and want to.

If you send your coins from wallet A to wallet B with CoinJoin, it's not possible for a third party to identify this transaction, but you can disclose the seed of wallet A and sign a transaction from wallet B thus proving ownership of both.

[karottenreibe]

AFAICS none of your points addresses the problem posed by your parent commentor: someone accidentally sent a lot of money to the wrong account/wallet and wants it back, even if the receiver is uncooperative.

[ucha]

I'm not sure we understood the parent comment the same way but you're right, you can't get your money back if sent to someone uncooperative. However, you can call the authorities and prove that you sent funds to that person and let them recover it if possible. I only addressed the question of attribution.