In my country one bank had a 2fa app. Then they backtracked on security, but kept policy: they included the 2fa in the regular bank app. Now you don't have to use 2fa if you are using the bank app, because the bank app generates its own authorization, in the same device (app) without user interaction!
Fake admiration off. We also don't have to use any 2fa when we access banking through the website. (works on FF on Android)
Nope. And accessing the website/online banking portal is not allowed without going through the smartphone app 2fa too.