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How's your banking apps run on that?
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With the money you save by not using Apple, you can afford the cheapest phone compatible with your bank, if they don't have internet banking.
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Sure, if you want to carry 2 phones.
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I probably never opened one of my banking apps away from home. My main use for them is to authorize the operations I'm doing from my computer. I think that I could keep an Android phone in a drawer and use it as a costly and inconvenient hardware token. By the way, for some reasons credit card companies are doing 2FA by SMS which is both stupid (security wise) and convenient (to break out from Android or iOS.)

I expect that the real problem with using a Linux phone would be WhatsApp, Google Maps (the navigation part), OSMAnd. Telegram desktop maybe works.

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I switched to a bank not forcing me into the American duopoly.
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Then you’re not using a phone. You’re using a computer which happens to have phone capabilities. Surely you can see how this isn’t particularly useful for most people?
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