Yeah, I was trying to think how wallets could install a plugin to support ERC-7521, which requires a similar validateUserIntents function. I’m still confused why whatever you would have installed as a Pre User Operation Validation Hook couldn’t just be installed as a Pre Runtime Validation Hook for the function validateUserOp installed in some base 4337 plugin. This would allow you to stack any sort of additional rules that apply to specific user operations. It would be kind of ugly to add another exception to ERC-6900 for ERC-7521 user intent validity checks. It would also help reduce ERC-6900 complexity if there were no special exceptions at all.