[udev4096]

It's far from secure. You are using an outdated phone, which hasn't received any kind of firmware or vendor security patches in a while. And as far as I remember, LineageOS doesn't support relocking the bootloader which further reduces the overall security of your phone

[iforgotpassword]

What's the attack vector? There is nothing else installed on this phone, and I only turn it on when the banking website asks me to confirm the login via their app. So it's connected to my wifi for like 5 minutes.

Meanwhile my main phone is always on the mobile network, using a proprietary modem that's running ridiculously complex firmware that does edge, lte, 5g, VoIP, has its own tcp/ip stack and a dozen other super complex protocols, is closed source, gets no security reviews and is exposed to at least my mobile provider at all times. And that's just the modem. Don't let me get started with all the value-add software the phone vendor loaded the device up with. Some of which is running with elevated privileges. You seriously think this is more secure?