I think this claim could be made and rationally defended.
I’m generally of the opinion that more information is better than less. But for info to be usable and able to be interpreted by the user then it needs to be presented in a way that is useful.
I think one could therefore rationally claim that throwing all the information in the app would make it more difficult to navigate, users would suffer from information overload and the efficacy of the app would go down because users are confronted with all the information.
Take, for example, the Dozens app. A common piece of feedback has been that the app is too busy.
The art of good service design is to balance complexity and usability. This is what Monzo is trying to achieve.
It’s an art, not a science. Subjective rather than objective. And, in my view, complementary rather than at odds to Monzo’s mission.