Thats ... false. Every bank I have used in Denmark allows me to log in and do all operations without an app. They require authentication and authorization using the national digital identity (MitID) which comes as an app, but also as a TOTP token and a FIDO (or similar) chip. No apps needed.
I guess the smartcard reader is equivalent. But my point is that locking down the OS of the phone is sufficient to establish client trust but not necessary. You should always be allowed to run the app without strong Play Integrity verification but then just be required to scan your hardware token with NFC in every authentication and authorization flow.
I guess the smartcard reader is equivalent. But my point is that locking down the OS of the phone is sufficient to establish client trust but not necessary. You should always be allowed to run the app without strong Play Integrity verification but then just be required to scan your hardware token with NFC in every authentication and authorization flow.