I wouldn't be surprised if OP had truly mandatory banking apps. I use Revolut, which has no web interface. My main bank does have a web interface, but because

I wouldn't be surprised if OP had truly mandatory banking apps. I use Revolut, which has no web interface. My main bank does have a web interface, but because they've made a complete mess of implementing PSD2, they also require you to use their app on a non-rooted device to confirm any web login.