Agreed! When reading late at night (in the bedroom, for example), it’s jarring to switch from a site that has proper dark mode to HN.
I can understand some of the pushback, because at the start ”dark mode” felt mostly like a fad, but in low ambient light conditions, it really makes reading much easier and thus brings quite a bit of value.
Of course it takes a bit of work to do it well, but that’s the case for all UX, and we don’t just ignore UX because ”ugh… work”