I'm amazed that banking apps are the make or break example for so many people when choosing a non-apple/non-google mobile OS. How much banking is everyone doing on-the-go?! Just use the website! Use the mobile website if you must!
And my banks still use SMS MFA, so I could login online using a dumber phone.
The only alternative they offer is SMS-based 2FA which, unsurprisingly, often has an additional cost.