23Sha-ger There are some that do not have physical cards to be able to do that as the card is digitally stored on the phone in the banks app. I think in the future more and more bank cards are going to be digital only cards to cut down on plastic waste and costs and for security reasons like stolen cards, etc.
That said I am wondering if it would be possible to run a VM inside G-OS that just runs what is needed for Google Pay to work correctly. Dual boot also might be an option but more of a pain when you are at a check-out line as you would need to reboot the phone in order to make the payment.
Or... just a thought... a smart case that just runs Google pay? Since everyone puts a case on their phone anyway.