We tried forcing dark mode in our last app update and saw a significant increase in user complaints about readability. Would love to hear more about the eye comfort argument for dark mode.
I'd pick Follow system settings, as it allows users to stick to their preferred mode across apps. What about apps with complex navigation, do you think one mode works better than the other?
We tried Light mode by default and saw a significant drop in user engagement at night; switching to Dark mode boosted usage. Have you considered user behavior at different times of day?