My banking app works fine on a rooted phone that I don't bother faking a proper Play Integrity signature for. Except for a warning about the phone being rooted when setting it up, of course. I'm not 100% sure what happens when you have integrity and lose it by rooting your phone, but I imagine the bank app will log you out.

Bank apps only stop working because banks decided they know better than you.

Unfortunately my bank also switched to Google Pay which does require Play Integrity, so contactless payments are out of the question on that phone now. Maybe if Wero compatible terminals extend support for QR payments I could use my bank app again on that phone.