You can’t prove identity when authenticating without linking back to IDV.
The identity created during IDV / KYC must be a constant reference point when a user authenticates.
SMS OTPs only prove that someone has your phone.
FaceID links back to your FaceID account, not the IDV / KYC identity.
If there's no link between authentication and IDV, there is no genuine identity assurance - you can't confirm it’s still the right person behind the screen.