No way, dark mode is great. Combine it with an internet browser that has a night mode (Samsung's fork of Chrome) and the phones are significantly more pleasant to use at night.
prefers-color-scheme recently landed in all major browsers: https://caniuse.com/#search=prefers-color-scheme
> and app you use support it
This is a prerequisite for that. You're not gonna manually turn on dark mode in every single app for much longer, your OS will support it as a setting and third-party apps (including browsers) will read that setting and adjust accordingly.