The only standardization proposal is the interface to retrieve and create accounts with a common signing pattern.
Why? So that web3 wallets could also have a mechanism to provide access to web3 auth for web2 wallets. We were initially looking to extend this proposal to include a way to do web3 auth as well, but trying to see if ERC-6492 could be adapted to achieve this or whether we would have to include an extension in this proposal as well.
We wanted this out there to spur discussion on how this type of account could be integrated into other existing web3 auth standards.
So, as written, you’re right, there doesn’t need to be a standard for the concept of claim/account creation. But the proposal is definitely not in it’s final form and we want to include some counterfactual wallet signature validation support.