Dark mode is useful because its always usable regardless of screen brightness. Who wants to be chaining their brightness all day? Also for high contrast, white

Dark mode is useful because its always usable regardless of screen brightness. Who wants to be chaining their brightness all day? Also for high contrast, white text on black is always readable while the reverse is not true, limiting the contrast. And the points you mention are not a problem with dark mode but with low contrast. These can be fixed by increasing contrast.