So just use the web site.
Typically, the only thing an app offers that the web site doesn't is paper check scan and deposit. Do you really need this? I don't.
Lots of people seem to be unaware that a web site can be pinned to your home screen with an icon --- just like an app.
Where I live you could barely survive without the bank app for daily payments. Sometimes is has maintenance around 1AM, which often coincides with trying to pay a bill after a night out. Causes some scrambling to find cash, or try another bank app.
Apps offer built in biometric login, websites don’t. So that’s one difference, and maybe it’s also the answer to the question of why they don’t allow rooted devices which might allow bypassing biometric checks.
Some banks in the EU do not even have an e-banking website (all app-only). Revolut is another example of an app-first / app-only bank, but I can think of plenty of other examples for my country
Maybe it's different in the US, but in many EU banks you now have to use the app for 2FA. Some banks offer alternatives but many don't.