What is considered to be feedback ?
When the user taps the button in the application and doesn't receive an action after it, it is most likely that they will think that the app is not responding. When the user taps the button and receives the «Something went wrong» message instead of the informative message about the mistake, it is going to be quite hard to work with an application as it is hard to understand where a crash occurred. When the user tries to perform any operation and doesn’t receive any instructions and hints from the app, it will be harder for them to finish it.
Especially this is the case, when the actions are not simple and a user is not an experienced one. In all these cases, it is most likely that the application is going to be deleted. Nowadays, almost every application has an analogue that will have the feedback connection with the user, making it easier to work with an app.