I’m pretty sure my bank’s android app is just webview considering it has a cookie banner when starting it and it looks almost identical to the actual bank website. The biggest feature of the bank app is for 2FA, but it’s not like it’s much more convenient than SMS and they really should be supporting FIDO2 and TOTP codes for actually secure 2FA.
The OP6 is already so big that it’s quite the brick with a case. I’m hoping that the people working at Fairphone can get PostmarketOS running reasonably well on their devices considering PostmarketOS aligns pretty well with their goals.