ING in Germany forces you to either have a single Google approved smartphone or a single authenticator, not both.
DKB requires a paid Girocard to use the authenticator or a Google approved smartphone.
N26 requires a single phone but they are a bit lenient. However they have way too many incidents reported where they closed people's accounts without a reason.
The traditional banks have high fees. One pays upwards 10 - 15 Euros a month for Sparkasse or Commerzbank for a simple checking account. Using Sparkasse means you cannot deposit money outside county (yes county and country) borders. Many traditional banks have high fees for withdrawing outside the network.
So one is forced to choose between modern banks with better online experience that's tied to Google and Apple or a traditional bank with oftentimes awful online experience and high fees.
[0] https://www.1822direkt.de/service/fragen-und-antworten/detai...
I do not understand how you are coming to that conclusion regarding modern banks. You can use the authentication device, which is completely independent of Google or Apple.
Absurd thing is that 1822 claims to make things much more secure but their 2FA reset with a single phone PIN is a joke.