[rob74]

You don't need the banking app for actual banking, but you need it for 2FA if you want to use the bank website on your PC. Some banks also offer an additional "authentication device", which would be an alternative for LineageOS users, but that's an additional device that you have to take care of, carry around etc., so much less convenient than using the app...

[medo-bear]

my mobile banking app is only good for looking up the balance, which i really dont need to do that often. for anything more complicated using the phone is just irritating and i more frequently turn to my desktop or laptop. moreover if banking is so significant to you, and you hold alot of funds, perhaps you should really then think about having a secure isolated banking device.