What is feature blindness?
Feature blindness occurs when users are too focused on the features they use the most that they neglect other features. This behavior is rooted in human psychology — aka the brain's instinctual ability to filter out unnecessary information and respond only to certain stimuli.
What is blind function in an app?
Users of your app are there to get things done. They build behavior patterns and workflows around the features they really need, and in doing so, start to forget about the others. As they sink into your app, they become feature blind.