Wait till you find out that your prefered Linux bank won't have the same mortgage terms as you'd like and you'll be running to buy a Google/Apple phone to get those % down.
I have no problem with a device that they trust being used for transaction approval, but that device shouldn't also be the device I use for my daily life and do all sorts of private things on. We should want to be able to inspect that one
Still, I'm plenty okay with my phone as a second factor for my laptop and vice versa for nearly all services. The rest is about tying things to a government identity (bank cares only if it's me who's authorising the transaction; government cares only if it's me who's requesting a student loan) and can be done with the chip that's already in my identity document and a single 20€ nfc chip reader or by using a phone as nfc reader