Plato's cave. If all you have ever experienced is a shit app, then the shit app seems fine to most people. Others will recognize its faults but not how bad it is because they think that the only alternative is to have no app.
The submarine company is also an example of this. Why listen to material scientists or engineers when you can cut corners to save a buck? Submarine experts told the CEO it was just a matter of time before the carbon fiber went pop, and that would be really bad for anyone inside at the time. But they saved so much money!