I know people that love the new iOS 13 Dark Mode and others that prefer the old standby Light Mode. I use Dark Mode on my iOS Devices and my Mac, I really like it. If I need Light Mode I can switch quickly, do what I need to do and switch back. Apparently, iOS 13 Dark Mode yields better battery life. This article explains the testing between Dark Mode and Light Mode. This might be another reason to switch to Dark Mode, just a thought.