Vouching your comment from dead to reply in good faith:

your bank’s app sucks, tell them they suck,

and or use the webapp.

Tens of thousands of financial institution apps work A-OK on GrapheneOS,

that is my objection.

That’s good to know. Is there a list? Maybe a vocal community of computer literate people with money could loudly move to banks that do work (regardless of which phone they have).