mgeo Each bank decides how to balance costs, risks, and benefits, likewise Google. We might prefer if Google trusted their wallet app on GrapheneOS, but it may well never happen. We might prefer if our favorite banks did their own NFC payment support, but that is their choice.
With hardware attestation, there isn't a way for GrapheneOS to tweak something and override Google's choices or banks' choices (I think this is what the original poster was asking about).