There are a lot of errors that pop up later after the app has been made live. These problems can easily be avoided during the early stages of development. For example, some faults are simply the wrong assumptions about user behavior or navigation. There are also a lot of features that aren’t required and their inclusion does nothing but confuses the users. The efficiency of the UI/UX designs can help companies jump over this problem altogether.
https://techugoblog.blogspot.com/2021/02/do-brands-need-to-invest-in-uiux.html