Colors and Contrast in an app design

I’ve been asked this question many times that is it necessary to focus on the colors and contrast of an app. Well, it is always a great idea to think about the colors and contrast that you implement in your application. You may have already created a large and beautiful screen with amazing shades in the background, but your users’ background will not be the same as your application. Users may be in a disadvantageous place for your application. The reflection effect that app development companies use nowadays is so intense that the elements of your interface may disappear when your users are not in a place favorable to your application. What do you think?