> users can not (and a tiny subset of users that actually know how to, will not) securely manage* key material. True. And the is also true for password. Sure,

> users can not (and a tiny subset of users that actually know how to, will not) securely manage* key material. True. And the is also true for password. Sure, generation is different and a way to authorizing a transaction is different, but otherwise form usage perspective password can be viewed as a primitive case of a private key. And industry made a huge progress in password authentications: password managers, OTP, biometric authentications, WebAuthn, etc. Specifically password managers and biometric authentication mechanisms can be re-used for private keys as well. Having multiple wallets, multisig authentication and smart contracts allows to have recovery paths, while making sure that varios custodians can only perform certain transactions and in a transparent way.